Title: CA $571 Cheap British Airways fights from Seattle to London - Expedia.ca ![](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) # CA $571 Cheap British Airways fights from Seattle (SEA) to London (LON) [View CA $571 flight on Sun, Feb 15, 2026](https://expedia.ca/Flights-Search?trip=oneway&leg1=from:SEA,to:LHR,departure:15/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:570.50&airProductToken=AQp_Cj0IwoIBEgQ0MzgyGJIBIK4cKJOehQMwjaCFAzhPQABYAWoFTk9CQUdyCE9MTjhUNEJWegoIwYIBEgQ0MzgyCj4IwoIBEgQxNTQzGK4cIOuJASjDooUDMI-mhQM4T0ABWAFqBU5PQkFHcghPTE44VDRCVnoKCMGCARIEMTU0MxIKCAEQARgBKgJCQRgBIgQIARABKAIoAzAN) - [Roundtrip](?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 30% 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.ca/login) ## British Airways flights from Seattle to London (SEA→LON) Prices were available within the past 7 days and start at CA $571 for one-way flights and CA $884 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Roundtrip ![British Airways](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/BA.gif) Mon, Mar 2 - Mon, Mar 16 SEA Seattle LHR London CA $884 Roundtrip found 3 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:LHR,departure:02/03/2026TANYT&leg2=from:LHR,to:SEA,departure:16/03/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:883.50&airProductToken=AQoyCjAIwoIBEgI0OBiSASDriQEoqsyGAzDk0IYDOE9AAFgBagVOT0JBR3IIT0xOOFQxQlYKMgowCMKCARICNDkY64kBIJIBKJ_khwMw9-iHAzhPQABYAWoFTk9CQUdyCE9MTjhUMUJWEgoIARABGAEqAkJBGAEiBAgBEAEoAigDMA0) ![British Airways](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/BA.gif) Tue, Jan 6 - Tue, Jan 13 SEA Seattle LCY London CA $1,416 Roundtrip found 3 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:LCY,departure:06/01/2026TANYT&leg2=from:LCY,to:SEA,departure:13/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1415.49&airProductToken=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) ![British Airways](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/BA.gif) Sun, Jan 4 - Wed, Jan 14 SEA Seattle LGW London CA $1,558 Roundtrip found 2 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:LGW,departure:04/01/2026TANYT&leg2=from:LGW,to:SEA,departure:14/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1557.70&airProductToken=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) ## Find the cheapest month to fly from Seattle (SEA) to London (LON) ### October is typically the cheapest month to fly From CA $668 - CA $1,249 per traveller. ## Alternative airports near London Prices were available within the past 7 days. Prices and availability are subject to change. [](https://www.expedia.ca/Flights-Search?leg1=from:SEA,to:LHR,departure:05/01/2026TANYT&leg2=from:LHR,to:SEA,departure:03/04/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) LHR Heathrow 28 min [Flights from CA $1,364 ](https://www.expedia.ca/Flights-Search?leg1=from:SEA,to:LHR,departure:05/01/2026TANYT&leg2=from:LHR,to:SEA,departure:03/04/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) [](https://www.expedia.ca/Flights-Search?leg1=from:SEA,to:LGW,departure:05/01/2026TANYT&leg2=from:LGW,to:SEA,departure:19/01/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) LGW Gatwick 52 min [Flights from CA $1,067 ](https://www.expedia.ca/Flights-Search?leg1=from:SEA,to:LGW,departure:05/01/2026TANYT&leg2=from:LGW,to:SEA,departure:19/01/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) [](https://www.expedia.ca/Flights-Search?leg1=from:SEA,to:LCY,departure:05/01/2026TANYT&leg2=from:LCY,to:SEA,departure:12/01/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) LCY London City CheapestClosest 21 min [Flights from CA $1,038 ](https://www.expedia.ca/Flights-Search?leg1=from:SEA,to:LCY,departure:05/01/2026TANYT&leg2=from:LCY,to:SEA,departure:12/01/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) __Flight from Seattle to London (SEA - LGW) route information__ | Origin airport | Seattle - Tacoma Intl. | | ------------------- | ---------------------- | | Destination airport | Gatwick | | Distance | 7697 km | \*Available to Expedia members.