Title: £342 Flights from London Heathrow to Seattle (LHR to SEA) - Expedia.co.uk ![](https://images.trvl-media.com/place/178307/82efb684-8d05-4b09-b7ea-52d5ab4ea1ac.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://images.trvl-media.com/place/178307/82efb684-8d05-4b09-b7ea-52d5ab4ea1ac.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # £342 Cheap Flights from London (LHR) to Seattle (SEA) [View £342 flight on Sun, 6 Sept 2026](https://expedia.co.uk/Flights-Search?trip=oneway&leg1=from:LHR,to:SEA,departure:06/09/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:341.92&airProductToken=AQp_Cj4IwYIBEgQ5MDA0GOuJASCHWSjuiZcDMJiLlwM4T0AAWAFqBUJBU0lDcghPTFg1QzVCNHoKCMGyARIEOTAwNAo9CMGCARIEOTAyMxiHWSCSASillJcDMOSYlwM4T0ABWAFqBUJBU0lDcghPTFg1QzVCNHoKCMGyARIEOTAyMxIKCAIQARgCKgJBQRgBIgQIARABKAIoAygEMAs) - [Return](?flightType=roundtrip) - [One-way](?flightType=oneway) - [Multi-city](?flightType=multicity) ### Travellers Adults ChildrenAges 2 to 17 InfantsYounger than 2 EconomyPremium economyBusiness classFirst class Leaving from Going to Departing Returning Add a place to stay Add a car Direct flights only ## Popular airlines from Heathrow Airport (LHR) to Seattle-Tacoma International Airport (SEA) - ![British Airways](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_BA.svg) British Airways [](https://www.expedia.co.uk/Flights-Search?leg1=from:lhr,to:sea,departure:14/11/2025TANYT&leg2=from:sea,to:lhr,departure:21/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"BA"}}]) - ![Finnair](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AY.svg) Finnair [](https://www.expedia.co.uk/Flights-Search?leg1=from:lhr,to:sea,departure:14/11/2025TANYT&leg2=from:sea,to:lhr,departure:21/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AY"}}]) - ![Air Canada](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AC.svg) Air Canada [](https://www.expedia.co.uk/Flights-Search?leg1=from:lhr,to:sea,departure:14/11/2025TANYT&leg2=from:sea,to:lhr,departure:21/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AC"}}]) - ![Icelandair](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_FI.svg) Icelandair [](https://www.expedia.co.uk/Flights-Search?leg1=from:lhr,to:sea,departure:14/11/2025TANYT&leg2=from:sea,to:lhr,departure:21/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"FI"}}]) - ![Iberia](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_IB.svg) Iberia [](https://www.expedia.co.uk/Flights-Search?leg1=from:lhr,to:sea,departure:14/11/2025TANYT&leg2=from:sea,to:lhr,departure:21/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"IB"}}]) - ![Aer Lingus](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_EI.svg) Aer Lingus [](https://www.expedia.co.uk/Flights-Search?leg1=from:lhr,to:sea,departure:14/11/2025TANYT&leg2=from:sea,to:lhr,departure:21/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"EI"}}]) - ![KLM](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_KL.svg) KLM [](https://www.expedia.co.uk/Flights-Search?leg1=from:lhr,to:sea,departure:14/11/2025TANYT&leg2=from:sea,to:lhr,departure:21/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"KL"}}]) ![notification illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__notification.svg) ### Be in the know Get alerts if flight prices drop or rise\* ![deals illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__deals.svg) ### Book smarter Save up to 25% on select hotels after you book a flight\* ![trophy illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__trophy.svg) ### Earn twice Earn your airline miles on top of our rewards [Sign in](https://www.expedia.co.uk/login) ## Cheap Flights from London (LHR) to Seattle (SEA) Prices were available within the past 7 days and start at £342 for one-way flights and £430 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Return ![Icelandair](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/fi.gif) Mon, 12 Jan - Thu, 15 Jan LHR London SEA Seattle £430 Return found 1 day ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LHR,to:SEA,departure:12/01/2026TANYT&leg2=from:SEA,to:LHR,departure:15/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:429.02&airProductToken=AQplCjEIxpIBEgM0NTEY64kBIIopKJ-eggMw4p-CAzhYQABYAWoFTElHSFRyCFhKMk1HQkxUCjAIxpIBEgM2ODEYiikgkgEovKCCAzCcpIIDOFhAAVgBagVMSUdIVHIIWEoyTUdCTFQKZQowCMaSARIDNjgwGJIBIIopKOvEggMwt8iCAzhYQABYAWoFTElHSFRyCFhKMk1HQkxUCjEIxpIBEgM0NTAYiikg64kBKIfJggMwysqCAzhYQAFYAWoFTElHSFRyCFhKMk1HQkxUEgoIARABGAEqAkZJGAEiBAgBEAEoAigDKAQwAQ) ![Aer Lingus](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/EI.gif) Mon, 10 Nov - Wed, 19 Nov LHR London SEA Seattle £479 Return found 1 day ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LHR,to:SEA,departure:10/11/2025TANYT&leg2=from:SEA,to:LHR,departure:19/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:478.79&airProductToken=AQpiCjAIxZIBEgMxNTkY64kBIIMNKLrZ_AIwj9r8AjhRQABYAWoEU0FWUnIIT0xOMFQxQjQKLgjFkgESAjUzGIMNIJIBKL7b_AIwjOD8AjhPQAFYAWoEU0FWUnIIT0xOMFQxQjQKYgouCMWSARICNTIYkgEggw0olcb9AjC2yv0COE9AAFgBagRTQVZScghPTE4wVDFCNAowCMWSARIDMTc0GIMNIOuJASj-y_0CMM7M_QI4UEABWAFqBFNBVlJyCE9MTjBUMUI0EgoIARABGAEqAkVJGAEiBAgBEAEoAigDKAQwDQ) ![Delta](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/DL.gif) Sat, 31 Jan - Thu, 5 Feb LHR London SEA Seattle £481 Return found 3 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LHR,to:SEA,departure:31/01/2026TANYT&leg2=from:SEA,to:LHR,departure:05/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:480.12&airProductToken=AQpwCjcIxJgBEgQ5NTg4GOuJASCAkwEopvGDAzD28YMDOEVAAFgBaglNQUlOQkFTSUNyCFZZQlJEOExBCjUIxJgBEgMxNDMYgJMBIJIBKMvygwMwxveDAzhFQAFYAWoJTUFJTkJBU0lDcghWWUJSRDhMQQpuCjUIxJgBEgM0NTkYkgEgwZMBKOythAMwtbCEAzhFQABYAWoJTUFJTkJBU0lDcghWWUJSRDhMQQo1CMSYARICNTgYwZMBIOuJASjvsYQDMPq0hAM4RUABWAFqCU1BSU5CQVNJQ3IIVllCUkQ4TEESCggCEAEYAioCREwYASIECAEQASgCKAMoBDAB) ![KLM](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/KL.gif) Thu, 5 Feb - Tue, 10 Feb LHR London SEA Seattle £484 Return found 6 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LHR,to:SEA,departure:05/02/2026TANYT&leg2=from:SEA,to:LHR,departure:10/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:483.12&airProductToken=AQppCjMIy5gBEgQxMDAwGOuJASCAkwEoxqmEAzCWqoQDOExAAFgBagVMSUdIVHIIVllBUkQ4TEEKMgjLmAESBDYwMzMYgJMBIJIBKOuqhAMw3K-EAzhWQAFYAWoFTElHSFRyCFZZQVJEOExBCmcKMQjLmAESBDcwNjQYkgEgqVEo-OWEAzDD6IQDOFZAAFgBagVMSUdIVHIIVllBUkQ4TEEKMgjLmAESBDI1MDEYqVEg64kBKMTphAMw_OyEAzhWQAFYAWoFTElHSFRyCFZZQVJEOExBEgoIAhABGAIqAktMGAEiBAgBEAEoAigDKAQwDQ) ![British Airways](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/BA.gif) Fri, 26 Dec - Thu, 8 Jan LHR London SEA Seattle £486 Return found 15 hours ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LHR,to:SEA,departure:26/12/2025TANYT&leg2=from:SEA,to:LHR,departure:08/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:485.52&airProductToken=AQoyCjAIwoIBEgI1MxjriQEgkgEo1d2AAzCy4oADOE9AAFgBagVOT0JBR3IIT05OMFQxQjQKMgowCMKCARICNDgYkgEg64kBKIr4gQMwxPyBAzhPQABYAWoFTk9CQUdyCE9OTjBUMUI0EgoIARABGAEqAkJBGAEiBAgBEAEoAigDMA0) ![Air France](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AF.gif) Thu, 5 Feb - Tue, 10 Feb LHR London SEA Seattle £488 Return found 6 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LHR,to:SEA,departure:05/02/2026TANYT&leg2=from:SEA,to:LHR,departure:10/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:487.32&airProductToken=AQpmCjIIwYwBEgQxMzgxGOuJASDiMCi8qYQDMIyqhAM4TEAAWAFqBUxJR0hUcghWWUFSRDhMQQowCMGMARIDMzM4GOIwIJIBKOaqhAMwza-EAzhWQAFYAWoFTElHSFRyCFZZQVJEOExBCmcKMQjBjAESBDU3MjYYkgEgqVEo-OWEAzDD6IQDOFZAAFgBagVMSUdIVHIIVllBUkQ4TEEKMgjBjAESBDY3NTMYqVEg64kBKMTphAMw_OyEAzhWQAFYAWoFTElHSFRyCFZZQVJEOExBEgoIAhABGAIqAkFGGAEiBAgBEAEoAigDKAQwDQ) ![Lufthansa](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/LH.gif) Tue, 2 Dec - Tue, 9 Dec LHR London SEA Seattle £496 Return found 1 day ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LHR,to:SEA,departure:02/12/2025TANYT&leg2=from:SEA,to:LHR,departure:09/12/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:495.62&airProductToken=AQqkAQo1CMyQARIENDIwNRjriQEgjBUo7M7-AjDaz_4COEtAAFgBaghFQ09MSUdIVHIIS0xVNURYQlEKNAjMkAESAzQ3NhiMFSC4jQEoyND-AjC-1f4COEtAAVgBaghFQ09MSUdIVHIIS0xVNURYQlEKNQjMkAESBDY3NzYYuI0BIJIBKMfX_gIwhNj-AjhLQAFYAWoIRUNPTElHSFRyCEtMVTVEWEJRCm0KNAjMkAESBDc1MzcYkgEgrhwolKT_AjCQpv8COEtAAFgBaghFQ09MSUdIVHIIS0xVNURYQlEKNQjMkAESBDkzNTUYrhwg64kBKNmm_wIww6r_AjhLQAFYAWoIRUNPTElHSFRyCEtMVTVEWEJREgoIAhABGAIqAkxIGAEiBAgBEAEoAigDKAQwCw) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Tue, 4 Nov - Fri, 14 Nov LHR London SEA Seattle £502 Return found 14 hours ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LHR,to:SEA,departure:04/11/2025TANYT&leg2=from:SEA,to:LHR,departure:14/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:501.72&airProductToken=AQpoCjIIwYIBEgM3MzMY64kBIOKaASjhlfwCMIea_AI4QkAAWAFqBUJBU0lDcghPTk4wVDFCNAoyCMGCARIEMTU1ORjimgEgkgEo9Jr8AjDXnfwCOEJAAVgBagVCQVNJQ3IIT05OMFQxQjQKZQoxCMGCARIEMjA2ORiSASCuHCj-if0CMPeL_QI4QkAAWAFqBUJBU0lDcghPTE4wVDFCNAowCMGCARICODYYrhwg64kBKJ6M_QIw74_9AjhCQAFYAWoFQkFTSUNyCE9MTjBUMUI0EgoIAhABGAIqAkFBGAEiBAgBEAEoAigDKAQwCw) ![Iberia](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/IB.gif) Wed, 4 Feb - Tue, 10 Feb LHR London SEA Seattle £508 Return just found [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LHR,to:SEA,departure:04/02/2026TANYT&leg2=from:SEA,to:LHR,departure:10/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:507.72&airProductToken=AQqBAQo_CMmEARIENDIwNRjriQEgo7EBKJughAMwjKWEAzhPQABYAWoFQkFTSUNyCE9MTjBUMUI0egoIwYIBEgQ0MjA1Cj4IyYQBEgQ0NDM4GKOxASCSASiSp4QDMJuphAM4T0ABWAFqBUJBU0lDcghPTE4wVDFCNHoKCMGCARIENDQzOAp_Cj0IyYQBEgQ0NTUwGJIBIK4cKKTmhAMwn-iEAzhPQABYAWoFQkFTSUNyCE9MTjBUMUI0egoIwYIBEgQ0NTUwCj4IyYQBEgQzNjMzGK4cIOuJASjO6YQDMJ_thAM4T0ABWAFqBUJBU0lDcghPTE4wVDFCNHoKCMKCARIEMzYzMxIKCAIQARgCKgJJQhgBIgQIARABKAIoAygEMA0) ![Scandinavian Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/SK.gif) Sat, 12 Sept - Sun, 20 Sept LHR London SEA Seattle £509 Return found 9 hours ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LHR,to:SEA,departure:12/09/2026TANYT&leg2=from:SEA,to:LHR,departure:20/09/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:508.32&airProductToken=AQplCjEI05YBEgM1MDQY64kBIOI7KMDMlwMws82XAzhUQABYAWoFTElHSFRyCFRMRVU2R0hUCjAI05YBEgM5MzcY4jsgkgEo2daXAzCd25cDOFRAAVgBagVMSUdIVHIIVExFVTZHSFQKZgowCNOWARIDOTM4GJIBIOI7KP-qmAMwqq-YAzhMQABYAWoFTElHSFRyCExMRVU2R0hUCjII05YBEgQxNTE3GOI7IOuJASiwspgDMKizmAM4TEABWAFqBUxJR0hUcghMTEVVNkdIVBIKCAEQARgBKgJTSxgBIgQIARABKAIoAygEMAE) ## Find the cheapest month to fly from London (LHR) to Seattle (SEA) ### February is typically the cheapest month to fly From £362 - £717 per traveller. ## Alternative airports near Seattle Prices were available within the past 7 days. Prices and availability are subject to change. [](https://www.expedia.co.uk/Flights-Search?leg1=from:LHR,to:SEA,departure:14/11/2025TANYT&leg2=from:SEA,to:LHR,departure:19/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) SEA Seattle - Tacoma Intl. Cheapest 20 min [Flights from £510](https://www.expedia.co.uk/Flights-Search?leg1=from:LHR,to:SEA,departure:14/11/2025TANYT&leg2=from:SEA,to:LHR,departure:19/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) Flight from London to Seattle route information | Origin airport | Heathrow | | --- | --- | | Destination airport | Seattle - Tacoma Intl. | | Airlines serving | Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, Icelandair, JetBlue Airways, KLM, Lufthansa, Scandinavian Airlines, Singapore Airlines, Turkish Airlines, United, Virgin Atlantic, WestJet | | Return price | £429 | | Distance | 7657 km | | Average flight time | 3 hours 8 mins | ## Compare flights from London to Seattle easily and book with confidence For travelling on business or for pleasure, Expedia makes it easy to book your flights from London to Seattle. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to Seattle - Tacoma Intl. in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Heathrow to Seattle - Tacoma Intl..   To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights.  Grab a great deal on your flight from Heathrow (LHR) to Seattle - Tacoma Intl. (SEA) The easiest way to view the best deals on flights from London to Seattle today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Heathrow to Seattle - Tacoma Intl. start at just £430 and range up to £509.   To find an even better deal, try   - being flexible on your dates – midweek flights can be cheaper - looking for other airports near London and Seattle - booking your flight during January, the cheapest month on this route - varying your flight times – early morning and late at night are sometimes cheaper  Why you should book your London to Seattle flight with Expedia! We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Heathrow to Seattle - Tacoma Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.   Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.   ## Frequently asked questions ### How much is a flight from Heathrow Airport to Sea-Tac Airport? > Start packing your bags, because round-trip journeys from LHR to Seattle - Tacoma Intl. Airport (SEA) start from £430. That's based on airfares listed within the last 7 days on Expedia for flights departing within the next year. Prices can change quickly, so book now to secure the best deal. Prices and availability are subject to change. Additional terms apply. ### Do I need to pay a cancellation fee if I cancel my flight from Heathrow Airport (LHR) to Sea-Tac Airport? > Most flights can be cancelled online, but whether you incur a fee depends on your airline. If you do have to cancel your trip, follow the instructions in the [Customer Service Portal](https://www.expedia.co.uk/service/?langid=1033). ### How do I find cheap flights from Heathrow Airport to SEA that have flexible change policies? > Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for London Heathrow to Sea-Tac Airport flights, you'll see a "no change fees" filter for you to select. ### How far is the flight from Heathrow Airport (LHR) to Seattle - Tacoma Intl. Airport (SEA)? > With around 7,700 kilometres separating LHR and Seattle - Tacoma Intl. Airport (SEA), your flight will be a long one. Pack wisely to make your time on board more comfortable. Little things like an extra pair of socks and a good neck pillow can make a big difference. ### Which airlines fly direct from Heathrow Airport to Sea-Tac Airport? > Getting from London Heathrow to Sea-Tac Airport is easy when you have a good range of airlines to choose from. Here are a few of the best: > > > > - Virgin Atlantic - (VS) with 30 monthly flights > - American Airlines - (AA) with 30 monthly flights > - British Airways - (BA) with 30 monthly flights > - Delta Air Lines - (DL) with 17 monthly flights ### Are Heathrow Airport to Sea-Tac Airport flight tickets cheaper when they're purchased at the last minute? > Late planners can sometimes score a bargain, with some of the cheapest airfares from London Heathrow to SEA surfacing a few weeks before the departure date. If you'd rather book ahead, Expedia compares and updates all the best flight deals continuously — as early as a year in advance in some cases. It depends on the carrier though, as not all airlines advertise prices that far in advance. ## Explore a world of travel with Expedia - Accommodation - Flights - Packages - Cars - Other ### Accommodation - [5 Star Hotels in Bryn Mawr-Skyway](https://www.expedia.co.uk/5Star-Bryn-Mawr-Skyway-Seattle-Hotels.s50-n158768-0.Travel-Guide-Filter-Hotels) - [Bryn Mawr-Skyway Hotels](https://www.expedia.co.uk/Bryn-Mawr-Skyway-Seattle-Hotels.0-n158768-0.Travel-Guide-Filter-Hotels) - [B&B in Burien](https://www.expedia.co.uk/Burien-Bed-And-Breakfasts.d84625-aaBedAndBreakfasts.Travel-Guide-Accommodation) - [Burien Hotels](https://www.expedia.co.uk/Burien-Hotels.d84625.Travel-Guide-Hotels) - [Hotels with Hot Tubs in Des Moines](https://www.expedia.co.uk/Des-Moines-Hotels-Hotels-With-Hot-Tubs.0-0-d6751-tHotelsWithHotTubs.Travel-Guide-Filter-Hotels) - [Des Moines Hotels](https://www.expedia.co.uk/Des-Moines-Hotels.d6751.Travel-Guide-Hotels) - [Gay-Friendly Hotels in Downtown Burien](https://www.expedia.co.uk/Downtown-Burien-Seattle-Hotels-Gay-Friendly-Hotel.0-n6193214-0-tGayFriendlyHotel.Travel-Guide-Filter-Hotels) - [Highline Hotels](https://www.expedia.co.uk/Highline-Seattle-Hotels.0-n553248635975748526-0.Travel-Guide-Filter-Hotels) - [Hotels near Hogan Park](https://www.expedia.co.uk/Hogan-Park-Hotels.0-l6169735-0.Travel-Guide-Filter-Hotels) - [Fairmont Hotels in Kent](https://www.expedia.co.uk/Kent-Hotels-Fairmont.0-0-d8223--bFairmont.Travel-Guide-Filter-Hotels) - [Hilton Hotels in Kent](https://www.expedia.co.uk/Kent-Hotels-Hilton-Hotels.0-0-d8223--bHiltonHotels.Travel-Guide-Filter-Hotels) - [Hyatt Hotels in Kent](https://www.expedia.co.uk/Kent-Hotels-Hyatt-Hotels.0-0-d8223--bHyattHotels.Travel-Guide-Filter-Hotels) - [Marriott Hotels & Resorts in Kent](https://www.expedia.co.uk/Kent-Hotels-Marriott-Hotels-Resorts.0-0-d8223--bMarriottHotelsResorts.Travel-Guide-Filter-Hotels) - [Kent Hotels](https://www.expedia.co.uk/Kent-Hotels.d8223.Travel-Guide-Hotels) - [Houseboats in Kent](https://www.expedia.co.uk/Kent-Houseboats.d8223-aaHouseboats.Travel-Guide-Accommodation) - [Hotels near Kubota Garden](https://www.expedia.co.uk/Kubota-Garden-Hotels.0-l6276756-0.Travel-Guide-Filter-Hotels) - [Normandy Park Hotels](https://www.expedia.co.uk/Normandy-Park-Hotels.d6361385.Travel-Guide-Hotels) - [Hotels near North SeaTac Park](https://www.expedia.co.uk/North-SeaTac-Park-Hotels.0-l6276782-0.Travel-Guide-Filter-Hotels) - [Gay-Friendly Hotels in Rainier View](https://www.expedia.co.uk/Rainier-View-Seattle-Hotels-Gay-Friendly-Hotel.0-n553248635976382294-0-tGayFriendlyHotel.Travel-Guide-Filter-Hotels) - [Cheap Hotels in Renton](https://www.expedia.co.uk/Renton-Hotels-Budget-Hotels.0-0-d9705-tBudgetHotels.Travel-Guide-Filter-Hotels) - [Hotels with Indoor Pools in Renton](https://www.expedia.co.uk/Renton-Hotels-Hotels-With-Indoor-Pools.0-0-d9705-tHotelswithIndoorPools.Travel-Guide-Filter-Hotels) - [Spa Hotels in Renton](https://www.expedia.co.uk/Renton-Hotels-Spa-Hotels.0-0-d9705-tSpaHotels.Travel-Guide-Filter-Hotels) - [Renton Hotels](https://www.expedia.co.uk/Renton-Hotels.d9705.Travel-Guide-Hotels) - [Cheap Hotels in SeaTac](https://www.expedia.co.uk/SeaTac-Hotels-Budget-Hotels.0-0-d156205-tBudgetHotels.Travel-Guide-Filter-Hotels) - [Extended Stay America Hotels in SeaTac](https://www.expedia.co.uk/SeaTac-Hotels-Extended-Stay-America.0-0-d156205--bExtendedStayAmerica.Travel-Guide-Filter-Hotels) - [Hotels Suites in SeaTac](https://www.expedia.co.uk/SeaTac-Hotels-Hotel-Suites.0-0-d156205-thotelsuites.Travel-Guide-Filter-Hotels) - [Hotels with Parking in SeaTac](https://www.expedia.co.uk/SeaTac-Hotels-Hotel-With-Free-Parking.0-0-d156205-thotelwithfreeparking.Travel-Guide-Filter-Hotels) - [Hotels with Parking in SeaTac](https://www.expedia.co.uk/SeaTac-Hotels-Hotel-With-Parking.0-0-d156205-thotelwithparking.Travel-Guide-Filter-Hotels) - [Hotels with Room Service in SeaTac](https://www.expedia.co.uk/SeaTac-Hotels-Hotel-With-Room-Service.0-0-d156205-thotelwithroomservice.Travel-Guide-Filter-Hotels) - [Luxury Hotels in SeaTac](https://www.expedia.co.uk/SeaTac-Hotels-Luxury-Hotel.0-0-d156205-tLuxuryHotel.Travel-Guide-Filter-Hotels) - [Seatac Hotels](https://www.expedia.co.uk/SeaTac-Hotels.d156205.Travel-Guide-Hotels) - [Seattle Hotels](https://www.expedia.co.uk/Seattle-Hotels.d178307.Travel-Guide-Hotels) - [Southcenter Hotels](https://www.expedia.co.uk/Southcenter-Seattle-Hotels.0-n553248633938969434-0.Travel-Guide-Filter-Hotels) - [Hotels near The Boeing Company](https://www.expedia.co.uk/The-Boeing-Company-Hotels.0-l6258427-0.Travel-Guide-Filter-Hotels) - [Cheap Hotels in Tukwila](https://www.expedia.co.uk/Tukwila-Hotels-Budget-Hotels.0-0-d9989-tBudgetHotels.Travel-Guide-Filter-Hotels) - [Gay-Friendly Hotels in Tukwila](https://www.expedia.co.uk/Tukwila-Hotels-Gay-Friendly-Hotel.0-0-d9989-tGayFriendlyHotel.Travel-Guide-Filter-Hotels) - [Hotels with Indoor Pools in Tukwila](https://www.expedia.co.uk/Tukwila-Hotels-Hotels-With-Indoor-Pools.0-0-d9989-tHotelswithIndoorPools.Travel-Guide-Filter-Hotels) - [Tukwila Hotels](https://www.expedia.co.uk/Tukwila-Hotels.d9989.Travel-Guide-Hotels) - [Hotels near Van Doren's Landing Park](https://www.expedia.co.uk/Van-Dorens-Landing-Park-Hotels.0-l553248634979268559-0.Travel-Guide-Filter-Hotels) - [Hotels near Westfield Southcenter Mall](https://www.expedia.co.uk/Westfield-Southcenter-Mall-Hotels.0-l6127676-0.Travel-Guide-Filter-Hotels) - [White Center Hotels](https://www.expedia.co.uk/White-Center-Seattle-Hotels.0-n174112-0.Travel-Guide-Filter-Hotels) ### Flights - [Flights to Kent](https://www.expedia.co.uk/Cheap-Flights-To-Kent.d8223.Travel-Guide-Flights) - [Flights to SeaTac](https://www.expedia.co.uk/Cheap-Flights-To-SeaTac.d156205.Travel-Guide-Flights) - [Flights to Seattle](https://www.expedia.co.uk/Cheap-Flights-To-Seattle.d178307.Travel-Guide-Flights) - [Flights to Tukwila](https://www.expedia.co.uk/Cheap-Flights-To-Tukwila.d9989.Travel-Guide-Flights) - [Flights from Renton Municipal](https://www.expedia.co.uk/lp/airports/rnt/flights-from-renton-municipal-airport) - [Flights from Kent](https://www.expedia.co.uk/lp/flights/8223/flights-from-kent) - [Flights from Renton](https://www.expedia.co.uk/lp/flights/9705/flights-from-renton) - [Flights from Belfast (BFS) to Kenmore (KEH)](https://www.expedia.co.uk/lp/flights/bfs/keh/belfast-to-kenmore) - [Flights from Bristol (BRS) to Seattle (BFI)](https://www.expedia.co.uk/lp/flights/brs/bfi/bristol-to-seattle) - [Flights from Vancouver (CXH) to Hoquiam (HQM)](https://www.expedia.co.uk/lp/flights/cxh/hqm/vancouver-to-hoquiam) - [Flights from Vancouver (CXH) to Renton (RNT)](https://www.expedia.co.uk/lp/flights/cxh/rnt/vancouver-to-renton) - [Flights from Dublin (DUB) to Kenmore (KEH)](https://www.expedia.co.uk/lp/flights/dub/keh/dublin-to-kenmore) - [Flights from Edinburgh (EDI) to Kenmore (KEH)](https://www.expedia.co.uk/lp/flights/edi/keh/edinburgh-to-kenmore) - [Flights from Frankfurt (FRA) to Tacoma (TIW)](https://www.expedia.co.uk/lp/flights/fra/tiw/frankfurt-to-tacoma) - [Flights from Friday Harbor (FRD) to Seattle (LKE)](https://www.expedia.co.uk/lp/flights/frd/lke/friday-harbor-to-seattle) - [Flights from Fort Smith (FSM) to Seattle (BFI)](https://www.expedia.co.uk/lp/flights/fsm/bfi/fort-smith-to-seattle) - [Flights from Niagara Falls (IAG) to Seattle (BFI)](https://www.expedia.co.uk/lp/flights/iag/bfi/niagara-falls-to-seattle) - [Flights from Los Angeles (LAX) to Kenmore (KEH)](https://www.expedia.co.uk/lp/flights/lax/keh/los-angeles-to-kenmore) - [Flights from Los Angeles (LAX) to Renton (RNT)](https://www.expedia.co.uk/lp/flights/lax/rnt/los-angeles-to-renton) - [Flights from London (LHR) to Seattle (BFI)](https://www.expedia.co.uk/lp/flights/lhr/bfi/london-to-seattle) - [Flights from London (LHR) to Kenmore (KEH)](https://www.expedia.co.uk/lp/flights/lhr/keh/london-to-kenmore) - [Flights from London (LHR) to Seattle Paine Field Intl. Airport (PAE)](https://www.expedia.co.uk/lp/flights/lhr/pae/london-to-seattle-paine-field-intl-airport) - [Flights from London (LHR) to Bremerton (PWT)](https://www.expedia.co.uk/lp/flights/lhr/pwt/london-to-bremerton) - [Flights from London (LHR) to Renton (RNT)](https://www.expedia.co.uk/lp/flights/lhr/rnt/london-to-renton) - [Flights from Orlando (MCO) to Seattle (BFI)](https://www.expedia.co.uk/lp/flights/mco/bfi/orlando-to-seattle) - [Flights from Mojave (MHV) to Seattle (BFI)](https://www.expedia.co.uk/lp/flights/mhv/bfi/mojave-to-seattle) - [Flights from Melbourne (MLB) to Renton (RNT)](https://www.expedia.co.uk/lp/flights/mlb/rnt/melbourne-to-renton) - [Flights from Oita (OIT) to Seattle (BFI)](https://www.expedia.co.uk/lp/flights/oit/bfi/oita-to-seattle) - [Flights from Chicago (ORD) to Renton (RNT)](https://www.expedia.co.uk/lp/flights/ord/rnt/chicago-to-renton) - [Flights from Seattle Paine Field Intl. Airport (PAE) to Renton (RNT)](https://www.expedia.co.uk/lp/flights/pae/rnt/seattle-paine-field-intl-airport-to-renton) - [Flights from Palo Alto (PAO) to Seattle (BFI)](https://www.expedia.co.uk/lp/flights/pao/bfi/palo-alto-to-seattle) - [Flights from Phoenix (PHX) to Tacoma (TIW)](https://www.expedia.co.uk/lp/flights/phx/tiw/phoenix-to-tacoma) - [Flights from Raleigh (RDU) to Tacoma (TIW)](https://www.expedia.co.uk/lp/flights/rdu/tiw/raleigh-to-tacoma) - [Flights from Reykjavik (RKV) to Seattle (LKE)](https://www.expedia.co.uk/lp/flights/rkv/lke/reykjavik-to-seattle) - [Flights from Coppermine (YCO) to Seattle (LKE)](https://www.expedia.co.uk/lp/flights/yco/lke/coppermine-to-seattle) - [Flights from Dawson City (YDA) to Seattle (BFI)](https://www.expedia.co.uk/lp/flights/yda/bfi/dawson-city-to-seattle) - [Flights from Igloolik (YGT) to Seattle (BFI)](https://www.expedia.co.uk/lp/flights/ygt/bfi/igloolik-to-seattle) - [Flights from Victoria (YYJ) to Tacoma (TIW)](https://www.expedia.co.uk/lp/flights/yyj/tiw/victoria-to-tacoma) ### Packages - [Visit Burien](https://www.expedia.co.uk/Burien.dx84625) - [Des Moines Marina](https://www.expedia.co.uk/Des-Moines-Marina-Seattle.d6183466.Attraction) - [Kent Holidays](https://www.expedia.co.uk/Kent.d8223.Holidays-City-Breaks) - [Marine View Park](https://www.expedia.co.uk/Marine-View-Park-Seattle.d553248635019447037.Attraction) - [Visit Normandy Park](https://www.expedia.co.uk/Normandy-Park.dx6361385) - [Renton Holidays](https://www.expedia.co.uk/Renton.d9705.Holidays-City-Breaks) - [Visit Renton](https://www.expedia.co.uk/Renton.dx9705) - [Seatac Holidays](https://www.expedia.co.uk/SeaTac.d156205.Holidays-City-Breaks) - [Visit SeaTac](https://www.expedia.co.uk/SeaTac.dx156205) - [Visit Bryn Mawr-Skyway](https://www.expedia.co.uk/Seattle-Bryn-Mawr-Skyway.dx158768) - [Visit White Center](https://www.expedia.co.uk/Seattle-White-Center.dx174112) - [The Boeing Company](https://www.expedia.co.uk/The-Boeing-Company-Seattle.d6258427.Attraction) ### Cars - [Car hire near Angle Lake Park](https://www.expedia.co.uk/Compare-Cheap-Car-Hire-In-Angle-Lake-Park.d6276767.Car-Hire-Guide) - [Car hire near Des Moines Beach](https://www.expedia.co.uk/Compare-Cheap-Car-Hire-In-Des-Moines-Beach.d553248635983994718.Car-Hire-Guide) - [Car hire Renton](https://www.expedia.co.uk/Compare-Cheap-Car-Hire-In-Renton.d9705.Car-Hire-Guide) - [Car hire SeaTac](https://www.expedia.co.uk/Compare-Cheap-Car-Hire-In-SeaTac.d156205.Car-Hire-Guide) - [Car hire near The Boeing Company](https://www.expedia.co.uk/Compare-Cheap-Car-Hire-In-The-Boeing-Company.d6258427.Car-Hire-Guide) - [Enterprise Rental Cars in SeaTac](https://www.expedia.co.uk/Enterprise-Car-Rentals-In-SeaTac.d156205-c15.Car-Rental-Guide-Suppliers) - [Rent A Wreck Rental Cars in SeaTac](https://www.expedia.co.uk/Rent-A-Wreck-Car-Rentals-In-SeaTac.d156205-c33.Car-Rental-Guide-Suppliers) ### Other - [Things to do in Des Moines](https://www.expedia.co.uk/Things-To-Do-In-Des-Moines.d6751.Travel-Guide-Activities) - [Things to do in Kent](https://www.expedia.co.uk/Things-To-Do-In-Kent.d8223.Travel-Guide-Activities) \*Available to Expedia members.