Title: £309 Cheap British Airways flights from Seattle to London (SEA→LHR) - Expedia.co.uk ![](https://images.trvl-media.com/place/178279/2a1d5619-553b-468a-a773-e81b88024741.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ![](https://images.trvl-media.com/place/178279/2a1d5619-553b-468a-a773-e81b88024741.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # £309 Cheap British Airways flights from Seattle to London (SEA→LHR) [View £309 flight on Tue, 27 Jan 2026](https://expedia.co.uk/Flights-Search?trip=oneway&leg1=from:SEA,to:LHR,departure:27/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:309.00&airProductToken=AQoyCjAIwoIBEgI1MhiSASDriQEopcuDAzDkz4MDOE9AAFgBagVOT0JBR3IIT0xOOFQ0QlYSCggBEAEYASoCQkEYASIECAEQASgCKAMwDQ) - [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 - ![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) ## British Airways flights from Seattle to London (SEA→LHR) Prices were available within the past 7 days and start at £309 for one-way flights and £480 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Return ![British Airways](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/BA.gif) Sun, 8 Feb - Tue, 24 Feb SEA Seattle LHR London £480 Return found 1 hour ago [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:SEA,to:LHR,departure:08/02/2026TANYT&leg2=from:LHR,to:SEA,departure:24/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:479.19&airProductToken=AQpyCj0IwoIBEgQ0MzgyGJIBIK4cKOTPhAMw39GEAzhPQABYAWoFTk9CQUdyCE9MTjhUMUJWegoIwYIBEgQ0MzgyCjEIwoIBEgMyOTQYrhwg64kBKI7ThAMw39aEAzhPQAFYAWoFTk9CQUdyCE9MTjhUMUJWCjIKMAjCggESAjUzGOuJASCSASjVgIYDMLKFhgM4T0AAWAFqBU5PQkFHcghPTE44VDFCVhIKCAEQARgBKgJCQRgBIgQIARABKAIoAzAN) ## Find the cheapest month to fly from Seattle (SEA) to London (LHR) ### October is typically the cheapest month to fly From £361 - £638 per traveller. ## Alternative airports near London Prices were available within the past 7 days. Prices and availability are subject to change. [](https://www.expedia.co.uk/Flights-Search?leg1=from:SEA,to:LHR,departure:01/01/2026TANYT&leg2=from:LHR,to:SEA,departure:16/01/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) LHR Heathrow Cheapest 28 min [Flights from £592 ](https://www.expedia.co.uk/Flights-Search?leg1=from:SEA,to:LHR,departure:01/01/2026TANYT&leg2=from:LHR,to:SEA,departure:16/01/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) ## Frequently asked questions ### How much is a British Airways flight from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR)? ### What is the cheapest month to fly from SEA to LHR with British Airways? ### Does British Airways fly nonstop from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR)? ### How long does it take to fly from SEA to LHR with British Airways? ### Which day of the week has the most British Airways flights from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR)? ### What airports does British Airways fly into in London? ### What kind of luggage can I take on a British Airways flight from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR)? ### What type of plane does British Airways fly from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR)? ### Can I change or cancel my British Airways flight from Seattle - Tacoma Intl. Airport (SEA) to Heathrow Airport (LHR)? ## Travel information | Origin airport | Seattle - Tacoma Intl. | | ------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | Destination airport | Heathrow | | Airlines serving | Aer Lingus, Air Canada, Air France, Alaska Airlines, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, Icelandair, KLM, Lufthansa, Scandinavian Airlines, Singapore Airlines, Turkish Airlines, United, Virgin Atlantic, WestJet | | Popular airline | Virgin Atlantic | | Distance | 7657 km | | Average flight time | 17 hours 38 mins | ## Explore a world of travel with Expedia - Accommodation - Flights - Packages - [4 Star Hotels in Heathrow Villages ](https://www.expedia.co.uk/4Star-Heathrow-Villages-London-Hotels.s40-n553248635976382877-0.Travel-Guide-Filter-Hotels) - 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