Title: CA $567 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 $567 Cheap British Airways fights from Seattle (SEA) to London (LON) [View CA $567 flight on Thu, Mar 5, 2026](https://expedia.ca/Flights-Search?trip=oneway&leg1=from:SEA,to:LHR,departure:05/03/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:566.60&airProductToken=AQoyCjAIwoIBEgI0OBiSASDriQEoiu6GAzDE8oYDOE9AAFgBagVOT0JBR3IIT0xOOFQ0QlYSCggBEAEYASoCQkEYASIECAEQASgCKAMwDQ) - [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 - ![](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\* - ![](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\* - ![](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 $567 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) Thu, Mar 5 - Wed, Mar 18 SEA Seattle LHR London CA $884 Roundtrip just found [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:LHR,departure:05/03/2026TANYT&leg2=from:LHR,to:SEA,departure:18/03/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:883.30&airProductToken=AQoyCjAIwoIBEgI0OBiSASDriQEoiu6GAzDE8oYDOE9AAFgBagVOT0JBR3IIT0xOOFQxQlYKMgowCMKCARICNDkY64kBIJIBKN_6hwMwt_-HAzhPQABYAWoFTk9CQUdyCE9MWDhEN0JWEgoIARABGAEqAkJBGAEiBAgBEAEoAigDMA0) ![British Airways](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/BA.gif) Mon, Feb 23 - Wed, Mar 11 SEA Seattle LCY London CA $1,307 Roundtrip found 1 hour ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:LCY,departure:23/02/2026TANYT&leg2=from:LCY,to:SEA,departure:11/03/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1307.00&airProductToken=AQp7CjsIwoIBEgQ2MTQ4GJIBIIMNKJX-hQMwtoKGAzhRQABYAWoDQkFHcghRTFg0RDFNNXoKCMWSARIENjE0OAo8CMKCARIENDQ2NxiDDSDLwAEo4IOGAzC6hIYDOFFAAVgBagNCQUdyCFFMWDREMU01egoIw5QBEgQ0NDY3CnsKPAjCggESBDQ0NjQYy8ABIIMNKMirhwMwmKyHAzhRQABYAWoDQkFHcghRTFg0RDFNNXoKCMOUARIENDQ2NAo7CMKCARIENjE0ORiDDSCSASjerIcDMKyxhwM4UUABWAFqA0JBR3IIUUxYNEQxTTV6CgjFkgESBDYxNDkSCggBEAEYASoCQkEYASIECAEQASgCKAMwDQ) ![British Airways](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/BA.gif) Wed, Sep 9 - Thu, Sep 24 SEA Seattle LGW London CA $1,308 Roundtrip found 3 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:LGW,departure:09/09/2026TANYT&leg2=from:LGW,to:SEA,departure:24/09/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1307.89&airProductToken=AQpxCjwIwoIBEgQ3NTQxGJIBILiNASiQsZcDMMmxlwM4UUAAWAFqA0JBR3IIUUxXNEQxTTV6CgjBpgESBDc1NDEKMQjCggESBDIyNzgYuI0BIMuxASimupcDMNu-lwM4UUABWAFqA0JBR3IIUUxXNEQxTTUKuAEKPAjCggESBDIyNDQYy7EBIPNaKM7VmAMw89aYAzhPQABYAWoDQkFHcghPTFg4RDdNNXoKCMKoARIEMjI0NAo7CMKCARIENjAxMBjzWiCHWSiO3ZgDMKzdmAM4T0ABWAFqA0JBR3IIT0xYOEQ3TTV6CgjBsgESBDYwMTAKOwjCggESBDYwMDIYh1kgkgEo4N6YAzCk45gDOE9AAVgBagNCQUdyCE9MWDhEN001egoIwbIBEgQ2MDAyEgoIARABGAEqAkJBGAEiBAgBEAEoAigDKAQwAQ) ![British Airways](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/BA.gif) Mon, Mar 2 - Mon, Mar 9 SEA Seattle LCY London CA $1,375 Roundtrip found 8 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:LCY,departure:02/03/2026TANYT&leg2=from:LCY,to:SEA,departure:09/03/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:1375.00&airProductToken=AQp7CjsIwoIBEgQ2MTQ4GJIBIIMNKPXMhgMwltGGAzhRQABYAWoDQkFHcghRTFg0RDFNNXoKCMWSARIENjE0OAo8CMKCARIENDQ2NxiDDSDLwAEowNKGAzCa04YDOFFAAVgBagNCQUdyCFFMWDREMU01egoIw5QBEgQ0NDY3CnsKPAjCggESBDQ0NjQYy8ABIIMNKIiVhwMw2JWHAzhRQABYAWoDQkFHcghRTFc0RDFNNXoKCMOUARIENDQ2NAo7CMKCARIENjE0ORiDDSCSASielocDMOyahwM4UUABWAFqA0JBR3IIUUxXNEQxTTV6CgjFkgESBDYxNDkSCggBEAEYASoCQkEYASIECAEQASgCKAMwDQ) ## 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:20/02/2026TANYT&leg2=from:LHR,to:SEA,departure:01/03/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) LHR Heathrow Cheapest 28 min [Flights from CA $1,120 ](https://www.expedia.ca/Flights-Search?leg1=from:SEA,to:LHR,departure:20/02/2026TANYT&leg2=from:LHR,to:SEA,departure:01/03/2026TANYT&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:20/02/2026TANYT&leg2=from:LGW,to:SEA,departure:05/03/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) LGW Gatwick 52 min [Flights from CA $4,392 ](https://www.expedia.ca/Flights-Search?leg1=from:SEA,to:LGW,departure:20/02/2026TANYT&leg2=from:LGW,to:SEA,departure:05/03/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) ## Find the cheapest month to fly from Seattle (SEA) to London (LON) ### October is typically the cheapest month to fly From CA $673 - CA $1,263 per traveller. __Flight from Seattle to London (SEA - LGW) route information__ | Origin airport | Seattle - Tacoma Intl. | | ------------------- | ---------------------- | | Destination airport | Gatwick | | Distance | 7697 km | \*Available to Expedia members.