Title: £347 Cheap British Airways flights from London to Seattle (LHR→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) # £347 Cheap British Airways flights from London to Seattle (LHR→SEA) [View £347 flight on Wed, 4 Feb 2026](https://expedia.co.uk/Flights-Search?trip=oneway&leg1=from:LHR,to:SEA,departure:04/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:346.72&airProductToken=AQqcAQoyCMKCARIDNDc0GOuJASDBaCjYnoQDMNWfhAM4T0AAWAFqBU5PQkFHcglPTFg1QzVCNFAKMgjCggESBDE2MDgYwWgg71ko0qCEAzDzpIQDOE9AAVgBagVOT0JBR3IJT0xYNUM1QjRQCjIIwoIBEgQ2NzMwGO9ZIJIBKLamhAMwr6mEAzhPQAFYAWoFTk9CQUdyCU9MWDVDNUI0UBIKCAEQARgBKgJCQRgBIgQIARABKAIoAzAN) - [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 London to Seattle (LHR→SEA) Prices were available within the past 7 days and start at £347 for one-way flights and £494 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) Thu, 19 Mar - Sat, 28 Mar LHR London SEA Seattle £494 Return just found [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LHR,to:SEA,departure:19/03/2026TANYT&leg2=from:SEA,to:LHR,departure:28/03/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:493.42&airProductToken=AQoyCjAIwoIBEgI0ORjriQEgkgEo_4WIAzDXiogDOE9AAFgBagVOT0JBR3IIT05OMFQxQjQKMgowCMKCARICNDgYkgEg64kBKIjxiAMwvfWIAzhPQABYAWoFTk9CQUdyCE9OTjBUMUI0EgoIARABGAEqAkJBGAEiBAgBEAEoAigDMA0) ![British Airways](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/BA.gif) Sat, 27 Dec - Sat, 10 Jan LHR London SEA Seattle £496 Return just found [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LHR,to:SEA,departure:27/12/2025TANYT&leg2=from:SEA,to:LHR,departure:10/01/2026TANYT&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=AQppCjMIwoIBEgQxNTMwGOuJASCjsQEonuyAAzCe8YADOE9AAFgBagVOT0JBR3IIT05OMFQxQjQKMgjCggESBDY1NDUYo7EBIJIBKPbxgAMw-fOAAzhPQAFYAWoFTk9CQUdyCE9OTjBUMUI0CjIKMAjCggESAjQ4GJIBIOuJASjKjoIDMISTggM4T0AAWAFqBU5PQkFHcghPTk4wVDFCNBIKCAEQARgBKgJCQRgBIgQIARABKAIoAzAN) ![British Airways](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/BA.gif) Thu, 19 Mar - Sat, 28 Mar LHR London SEA Seattle £498 Return just found [](https://expedia.co.uk/Flights-Search?trip=roundtrip&leg1=from:LHR,to:SEA,departure:19/03/2026TANYT&leg2=from:SEA,to:LHR,departure:28/03/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:497.42&airProductToken=AQoyCjAIwoIBEgI0ORjriQEgkgEo_4WIAzDXiogDOE9AAFgBagVOT0JBR3IIT05OMFQxQjQKaQoyCMKCARIENTU4OBiSASCjsQEoj-2IAzD67ogDOE9AAFgBagVOT0JBR3IIT05OMFQxQjQKMwjCggESBDE1MzEYo7EBIOuJASjt74gDMI70iAM4T0ABWAFqBU5PQkFHcghPTk4wVDFCNBIKCAEQARgBKgJCQRgBIgQIARABKAIoAzAN) ## 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, Singapore Airlines, Turkish Airlines, United, Virgin Atlantic, WestJet | | Popular airline | Finnair | | Distance | 7657 km | | Average flight time | 3 hours 8 mins | ## Explore a world of travel with Expedia - 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