Title: £298 Cheap Flights from London to Seattle (LON 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://a.travel-assets.com/travel-assets-manager/fallback-images-brand/bex_flights_v2.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # £298 Cheap Flights from London (LON) to Seattle (SEA) [View £298 flight on Wed, 26 Nov 2025](https://expedia.co.uk/Flights-Search?trip=oneway&leg1=from:LHR,to:SEA,departure:26/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:297.60&airProductToken=AQpiCjAIxZIBEgMxNTUY64kBIIMNKK6M_gIwg43-AjhHQABYAWoEU0FWUnIIT0xYNUM1QjQKLgjFkgESAjUzGIMNIJIBKL6P_gIwjJT-AjhPQAFYAWoEU0FWUnIIT0xYNUM1QjQSCggBEAEYASoCRUkYASIECAEQASgCKAMoBDAN) - [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 London to Seattle, WA (SEA-Seattle - Tacoma Intl.) - ![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:lon,to:sea,departure:17/10/2025TANYT&leg2=from:sea,to:lon,departure:24/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"FI"}}]) - ![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:lon,to:sea,departure:17/10/2025TANYT&leg2=from:sea,to:lon,departure:24/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"BA"}}]) - ![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:lon,to:sea,departure:17/10/2025TANYT&leg2=from:sea,to:lon,departure:24/10/2025TANYT&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:lon,to:sea,departure:17/10/2025TANYT&leg2=from:sea,to:lon,departure:24/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"EI"}}]) - ![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:lon,to:sea,departure:17/10/2025TANYT&leg2=from:sea,to:lon,departure:24/10/2025TANYT&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:lon,to:sea,departure:17/10/2025TANYT&leg2=from:sea,to:lon,departure:24/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AC"}}]) - ![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:lon,to:sea,departure:17/10/2025TANYT&leg2=from:sea,to:lon,departure:24/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"KL"}}]) - ## Plan, book, fly with confidence - ### Be in the know Get alerts if flight prices drop or rise\* - ### Book smarter Save up to 25% on select hotels after you book a flight\* - ### Earn twice Earn your airline miles on top of our rewards [Sign in](https://www.expedia.co.uk/login) ## Cheap Flights from London (LON) to Seattle (SEA) Prices were available within the past 7 days and start at £298 for one-way flights and £401 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) Sat, 14 Feb - Sat, 21 Feb LHR London SEA Seattle £401 Return found 10 hours ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LHR,to:SEA,departure:14/02/2026TANYT&leg2=from:SEA,to:LHR,departure:21/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:400.62&airProductToken=AQplCjEIxpIBEgM0NTEY64kBIIopKL-RhQMwgpOFAzhYQABYAWoFTElHSFRyCFhKMk1HQkxUCjAIxpIBEgM2ODEYiikgkgEo3JOFAzC8l4UDOFhAAVgBagVMSUdIVHIIWEoyTUdCTFQKZQowCMaSARIDNjgwGJIBIIopKIvlhQMw1-iFAzhYQABYAWoFTElHSFRyCFhKMk1HQkxUCjEIxpIBEgM0NTAYiikg64kBKKfphQMw6uqFAzhYQAFYAWoFTElHSFRyCFhKMk1HQkxUEgoIARABGAEqAkZJGAEiBAgBEAEoAigDKAQwAQ) ![Icelandair](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/fi.gif) Wed, 22 Apr - Wed, 29 Apr LGW London SEA Seattle £401 Return found 18 hours ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LGW,to:SEA,departure:22/04/2026TANYT&leg2=from:SEA,to:LGW,departure:29/04/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:400.68&airProductToken=AQplCjEIxpIBEgM0NzMYy7EBIIopKLCEiwMw84WLAzhYQABYAWoFTElHSFRyCFhKMk1HQkxUCjAIxpIBEgM2ODMYiikgkgEo5oaLAzDBiosDOFhAAVgBagVMSUdIVHIIWEoyTUdCTFQKZQowCMaSARIDNjgyGJIBIIopKLjYiwMw9duLAzhYQABYAWoFTElHSFRyCFhKMk1HQkxUCjEIxpIBEgM0NzIYiikgy7EBKLbciwMw9N2LAzhYQAFYAWoFTElHSFRyCFhKMk1HQkxUEgoIARABGAEqAkZJGAEiBAgBEAEoAigDKAQwAQ) ![American Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AA.gif) Wed, 19 Nov - Sun, 30 Nov LGW London SEA Seattle £433 Return found 6 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LGW,to:SEA,departure:19/11/2025TANYT&leg2=from:SEA,to:LGW,departure:30/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:432.38&airProductToken=AQqbAQoyCMGCARIENzAxMhjLsQEgzHAoqL79AjD2wv0COE9AAFgBagVCQVNJQ3IIT0xYN0gxQjQKMgjBggESBDE4MzQYzHAgo7EBKIfJ_QIww8r9AjhCQAFYAWoFQkFTSUNyCE9MWDdIMUI0CjEIwYIBEgM3NjcYo7EBIJIBKPXK_QIwhM39AjhCQAFYAWoFQkFTSUNyCE9MWDdIMUI0CpoBCjEIwYIBEgQyMTQyGJIBIIwCKPDC_gIwxcX-AjhCQABYAWoFQkFTSUNyCE9MWDdIMUI0CjEIwYIBEgQzMDM4GIwCIMxwKMTG_gIwiMf-AjhCQAFYAWoFQkFTSUNyCE9MWDdIMUI0CjIIwYIBEgQ3MDExGMxwIMuxASjuyv4CMOLO_gI4T0ABWAFqBUJBU0lDcghPTFg3SDFCNBIKCAIQARgCKgJBQRgBIgQIARABKAIoAygEMAs) ![Swiss International Air Lines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/LX.gif) Tue, 10 Mar - Sat, 14 Mar LGW London SEA Seattle £435 Return found 5 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LGW,to:SEA,departure:10/03/2026TANYT&leg2=from:SEA,to:LGW,departure:14/03/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:434.78&airProductToken=AQqgAQo0CMywARIDNDMzGMuxASC5PCjAoocDMKmjhwM4S0AAWAFqCEVDT0xJR0hUcghLTFBPUERCUQoyCMywARICMzgYuTwgsnEo36qHAzC-sIcDOEtAAVgBaghFQ09MSUdIVHIIS0xQT1BEQlEKNAjMsAESBDMyNTYYsnEgkgEotrGHAzCtsocDOEtAAVgBaghFQ09MSUdIVHIIS0xQT1BEQlEKoAEKNAjMsAESBDMzMDIYkgEgsnEo-9CHAzCG0ocDOEtAAFgBaghFQ09MSUdIVHIIS0xQT1BEQlEKMgjMsAESAjM5GLJxILk8KM3ThwMw5tiHAzhLQAFYAWoIRUNPTElHSFRyCEtMUE9QREJRCjQIzLABEgM0MzIYuTwgy7EBKMXZhwMwrtqHAzhLQAFYAWoIRUNPTElHSFRyCEtMUE9QREJREgoIAhABGAIqAkxYGAEiBAgBEAEoAigDKAQwCw) ![KLM](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/KL.gif) Mon, 17 Nov - Thu, 4 Dec LHR London SEA Seattle £462 Return found 2 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LHR,to:SEA,departure:17/11/2025TANYT&leg2=from:SEA,to:LHR,departure:04/12/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:461.82&airProductToken=AQppCjMIy5gBEgQxMDAwGOuJASCAkwEoxqX9AjCWpv0COExAAFgBagVMSUdIVHIIVlkyNkRITE0KMgjLmAESBDYwMzMYgJMBIJIBKOum_QIw4av9AjhWQAFYAWoFTElHSFRyCFZZMjZESExNCjQKMgjLmAESBDYxMzMYkgEg64kBKLLt_gIw9vH-AjhWQABYAWoFTElHSFRyCFZZMjZESExNEgoIARABGAEqAktMGAEiBAgBEAEoAigDKAQwDQ) ![Austrian Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/OS.gif) Mon, 12 Jan - Sat, 17 Jan LHR London SEA Seattle £463 Return found 2 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LHR,to:SEA,departure:12/01/2026TANYT&leg2=from:SEA,to:LHR,departure:17/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:462.12&airProductToken=AQptCjUIz6YBEgQ3ODA1GOuJASCIGCiVnoIDMJOiggM4S0AAWAFqCEVDT0xJR0hUcghLTFBPUERCUQo0CM-mARIENzkwNxiIGCCSASifo4IDMImmggM4S0ABWAFqCEVDT0xJR0hUcghLTFBPUERCUQptCjQIz6YBEgQ3OTA4GJIBIIgYKKrYggMw3NqCAzhLQABYAWoIRUNPTElHSFRyCEtMUE9QREJRCjUIz6YBEgQ3ODA2GIgYIOuJASjY24IDMJDfggM4S0ABWAFqCEVDT0xJR0hUcghLTFBPUERCURIKCAIQARgCKgJPUxgBIgQIARABKAIoAygEMAs) ![Virgin Atlantic](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/VS.gif) Wed, 3 Dec - Mon, 22 Dec LHR London SEA Seattle £466 Return found 2 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LHR,to:SEA,departure:03/12/2025TANYT&leg2=from:SEA,to:LHR,departure:22/12/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:465.82&airProductToken=AQpFCiEI1qYBEgQ2NjU5GOuJASDiMCi82f4CMIza_gI4VEAAWAEKIAjWpgESBDM5ODcY4jAgkgEottv-AjDF4P4COFRAAVgBCiMKIQjWpgESBDQwNzAYkgEg64kBKPK3gAMwtryAAzhUQABYARIKCAEQARgBKgJWUxgBIgQIARABKAQwAQ) ![Aer Lingus](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/EI.gif) Mon, 10 Nov - Mon, 24 Nov LHR London SEA Seattle £467 Return found 1 hour ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LHR,to:SEA,departure:10/11/2025TANYT&leg2=from:SEA,to:LHR,departure:24/11/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:466.35&airProductToken=AQpiCjAIxZIBEgMxNTUY64kBIIMNKK7Y_AIwg9n8AjhaQABYAWoEU0FWUnIIT0xYOEMxQjQKLgjFkgESAjUzGIMNIJIBKL7b_AIwjOD8AjhPQAFYAWoEU0FWUnIIT0xYOEMxQjQKYgouCMWSARICNTIYkgEggw0otf79AjDWgv4COE9AAFgBagRTQVZScghPTFg4QzFCNAowCMWSARIDMTcyGIMNIOuJASjig_4CMLKE_gI4QUABWAFqBFNBVlJyCE9MWDhDMUI0EgoIARABGAEqAkVJGAEiBAgBEAEoAigDKAQwDQ) ![British Airways](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/BA.gif) Mon, 26 Jan - Mon, 2 Feb LGW London SEA Seattle £472 Return found 4 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LGW,to:SEA,departure:26/01/2026TANYT&leg2=from:SEA,to:LGW,departure:02/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:471.78&airProductToken=AQqfAQozCMKCARIENzE5NRjLsQEgjBgowbuDAzDNvIMDOE9AAFgBagVOT0JBR3IJT0xYN0gxQjRQCjMIwoIBEgQ0Mjk5GIwYIKOxASibwYMDMNLGgwM4T0ABWAFqBU5PQkFHcglPTFg3SDFCNFAKMwjCggESBDI0OTAYo7EBIJIBKJbLgwMwn82DAzhPQAFYAWoFTk9CQUdyCU9MWDdIMUI0UAqdAQoyCMKCARIENjg1NRiSASDvWSi0i4QDMOWNhAM4UUAAWAFqBU5PQkFHcglRTFg3SDFCNFAKMgjCggESBDE2MDUY71kgjBgovJCEAzDbk4QDOFFAAVgBagVOT0JBR3IJUUxYN0gxQjRQCjMIwoIBEgQ3MTk4GIwYIMuxASjol4QDMPSYhAM4UUABWAFqBU5PQkFHcglRTFg3SDFCNFASCggBEAEYASoCQkEYASIECAEQASgCKAMwDQ) ![Swiss International Air Lines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/LX.gif) Tue, 7 Oct - Sun, 12 Oct LCY London SEA Seattle £474 Return found 5 days ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LCY,to:SEA,departure:07/10/2025TANYT&leg2=from:SEA,to:LCY,departure:12/10/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:473.91&airProductToken=AQqkAQo0CMywARIDNDYxGMvAASC5PCiZ2fkCMPjZ-QI4TEAAWAFqCEVDT0xJR0hUcghMTFBPUERCUQo1CMywARIEODAxMBi5PCC4jQEozdr5AjC-3_kCOExAAVgBaghFQ09MSUdIVHIITExQT1BEQlEKNQjMsAESBDQ4NzYYuI0BIJIBKN7g-QIwoOH5AjhMQAFYAWoIRUNPTElHSFRyCExMUE9QREJRCp8BCjQIzLABEgQzMjU1GJIBIK4cKO6V-gIw7Zf6AjhMQABYAWoIRUNPTElHSFRyCExMUE9QREJRCjEIzLABEgE5GK4cILk8KOWY-gIw8pz6AjhMQAFYAWoIRUNPTElHSFRyCExMUE9QREJRCjQIzLABEgM0NjQYuTwgy8ABKNqf-gIwvqD6AjhMQAFYAWoIRUNPTElHSFRyCExMUE9QREJREgoIAhABGAIqAkxYGAEiBAgBEAEoAigDKAQwCw) ## Find the cheapest month to fly from London (LON) to Seattle (SEA) ### March is typically the cheapest month to fly From £319 - £670 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:17/10/2025TANYT&leg2=from:SEA,to:LHR,departure:22/10/2025TANYT&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 £547](https://www.expedia.co.uk/Flights-Search?leg1=from:LHR,to:SEA,departure:17/10/2025TANYT&leg2=from:SEA,to:LHR,departure:22/10/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) ## Frequently asked questions ### How much is a flight from London (LON-All Airports) to Sea-Tac Airport? > Within the past 7 days on Expedia, for flights departing within the next year, the lowest price advertised for a round-trip journey from London (LON-All Airports) to Sea-Tac Airport was £401. Cheap tickets don't wait forever, so book yours today. Prices and availability are subject to change. Additional terms apply. ### Do I need to pay a cancellation fee if I cancel my flight from London (LON-All Airports) to Seattle - Tacoma Intl. Airport (SEA)? > This can vary between airlines, as each has its own terms and conditions. Visit the [Customer Service Portal](https://www.expedia.co.uk/service/?langid=1033), where you'll find easy-to-follow instructions on how to cancel your flight online. ### How do I find cheap flights from London (LON-All Airports) to Sea-Tac Airport 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 (LON-All Airports) to SEA flights, you'll see a "no change fees" filter for you to select. ### How far is the flight from London (LON-All Airports) to Sea-Tac Airport? > The distance is around 7,700 kilometres, so fill your carry-on bag with all you need to make your journey comfortable. Not sure what to take on board your England to SeaTac flight? A travel pillow, earplugs and a sleep mask are a few essentials. ### Which airlines fly direct from London (LON-All Airports) to SEA? > Whether you're after a one-way or return flight, you'll have your choice of airlines that will take you straight from London (LON-All Airports) to Sea-Tac Airport. These are some of the most popular ones: > > > > - 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 London (LON-All Airports) to SEA flight tickets cheaper when they're purchased at the last minute? > Flight prices go up and down like a yo-yo, so not always. While last-minute deals between London (LON-All Airports) and Sea-Tac Airport are of course possible, it's also a good idea to keep a close eye on prices well before you fly. In fact, some carriers publish their prices up to a year before the departure date. Expedia is continuously updating the biggest bargains around, so keep checking back and be ready to book when the price is right. ## Travel 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, Swiss International Air Lines, Turkish Airlines, United, Virgin Atlantic, WestJet | | Return price | £401 | | Distance | 7657 km | ## Book with confidence ### 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 LON-All Airports 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 LON-All Airports (LON) 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 LON-All Airports to Seattle - Tacoma Intl. start at just £401 and range up to £474.   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 February, 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 LON-All Airports 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. 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