Title: Cheap Flights from Belfast (BFS) to Seattle (SEA) - Expedia.ca ![](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) # Cheap Flights from Belfast (BFS) to Seattle (SEA) - [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 ## Popular airlines from Belfast International Airport (BFS) to Seattle-Tacoma International Airport (SEA) - ![Air Canada](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AC.svg) Air Canada [](https://www.expedia.ca/Flights-Search?leg1=from:bfs,to:sea,departure:02/11/2025TANYT&leg2=from:sea,to:bfs,departure:09/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AC"}}]) - ![WestJet](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_WS.svg) WestJet [](https://www.expedia.ca/Flights-Search?leg1=from:bfs,to:sea,departure:02/11/2025TANYT&leg2=from:sea,to:bfs,departure:09/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"WS"}}]) - ![Flair Airlines](https://a.travel-assets.com/air/airlines/f8_sq.svg) Flair Airlines [](https://www.expedia.ca/Flights-Search?leg1=from:bfs,to:sea,departure:02/11/2025TANYT&leg2=from:sea,to:bfs,departure:09/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"F8"}}]) - ![American Airlines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_AA.svg) American Airlines [](https://www.expedia.ca/Flights-Search?leg1=from:bfs,to:sea,departure:02/11/2025TANYT&leg2=from:sea,to:bfs,departure:09/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AA"}}]) - ![United](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_UA.svg) United [](https://www.expedia.ca/Flights-Search?leg1=from:bfs,to:sea,departure:02/11/2025TANYT&leg2=from:sea,to:bfs,departure:09/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"UA"}}]) - ![Delta](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_DL.svg) Delta [](https://www.expedia.ca/Flights-Search?leg1=from:bfs,to:sea,departure:02/11/2025TANYT&leg2=from:sea,to:bfs,departure:09/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"DL"}}]) - ![Porter Airlines](https://forever.travel-assets.com/flex/flexmanager/images/2024/09/23/landing_airline_sq_logo_PD.svg) Porter Airlines [](https://www.expedia.ca/Flights-Search?leg1=from:bfs,to:sea,departure:02/11/2025TANYT&leg2=from:sea,to:bfs,departure:09/11/2025TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"PD"}}]) ![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) ## Frequently asked questions ### How much is a flight from Belfast Intl. Airport (BFS) to Seattle - Tacoma Intl. Airport (SEA)? > Based on airfares listed within the last 7 days on Expedia for flights departing within the next year, round-trip journeys between BFS and Seattle - Tacoma Intl. Airport (SEA) start from . Book now to get the best price for your trip. Prices and availability are subject to change. Additional terms apply. ### Do I need to pay a cancellation fee if I cancel my flight from Belfast International Airport to Sea-Tac Airport? > Every airline has a different set of terms and conditions. If you decide to cancel your escape, head to our [Customer Service Portal](https://www.expedia.ca/helpcenter). ### How do I find cheap flights from Belfast Intl. Airport (BFS) to SEA that have flexible change policies? > Many carriers offer the option to reschedule your flight at no extra charge. All you pay is the cost difference between the two flights. When searching for Belfast Intl. Airport (BFS) to Seattle - Tacoma Intl. Airport (SEA) flights, you'll see a "No change fees" filter for you to pick. ### How far is the flight from BFS to SEA? > You'll have 7,200 kilometres to cover on the long-haul Crumlin to SeaTac route. Dress in layers of comfortable clothes and consider taking a pair of noise-cancelling headphones. ### Which airlines fly direct from BFS to SEA? > Flying nonstop between BFS and Sea-Tac Airport isn't possible at present. However, you'll still be able to find a flight to SeaTac with at least one stop. ### Are Belfast Intl. Airport (BFS) to SEA flight tickets cheaper when they're purchased at the last minute? > Flight prices are constantly going up and down, so there are no guarantees. While last-minute deals between Belfast International Airport and SEA are of course possible, it also makes sense to keep track of prices well before you fly. In fact, some airlines publicize their prices up to 12 months prior to the departure date. Expedia is continuously updating the biggest airfare bargains around, so keep checking back and be ready to grab your seat when the price is right. ## Travel information | Origin airport | Belfast Intl. | | --- | --- | | Destination airport | Seattle - Tacoma Intl. | | Distance | 7141 km | ## Book with confidence ### Crumlin to Seattle Flights **The easy way to book your flights from Belfast to Seattle**  With Expedia, it’s simple to find and book flights to Seattle from Belfast whether you’re traveling for business or pleasure. Enter your travel dates, hit search, and choose your flight from airlines that cover this route. There are nonstop flights to Seattle - Tacoma Intl., too.   Choose your preferred carrier and cabin class with the advanced search tool and select your ideal departure time. Then, if you want, you can see just nonstop or refundable flights. And if you’re traveling last minute, just enter the date to check out flights from Belfast to Seattle today, tomorrow, or this week.   **Save dollars with cheap flights from Belfast Intl., BFS to Seattle - Tacoma Intl., SEA**  Sort your search results by price to find great deals on your flight from Belfast to Seattle—you get all your cheapest options first. Grab yourself a bargain now—the lowest price on flights to Seattle from Belfast currently is just rising to .   Here are more money-saving tips:  - Fly in when flight prices are normally at their lowest  - Book about a month to 6 weeks before you travel for the best prices to Seattle   - Avoid peak season and weekends when flights can cost more - Early morning and late-night flights are sometimes cheaper, so try varying your travel times  - One surefire way to save money on your flight is to book your flight and hotel together with Expedia. Sometimes, the savings are so large that the flight is basically free!  **Reasons to choose Expedia for your flight to Seattle from Belfast**  Whatever your destination, budget, or reason to travel, in just one quick search, you can choose from loads of flights, airlines, and cabin classes. The filters make it quick and easy to find your ideal flights, and if you choose one of the flexible options, you won’t be charged to change your flight. 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