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$583+ Cheap flights from Belfast Intl (BFS) to Seattle (SEA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/7. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — SEA
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap flight deals from Belfast Intl to Seattle

Cheapest flights from Belfast Intl to Seattle
Explore the most affordable flight options available from Belfast Intl to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 29, 2026.

This Mytrip deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/299:55 am
BFS
-
SEA
3 stops20h 11m
Multiple Airlines
Fri 2/62:35 pm
SEA
-
BFS
3 stops24h 10m
Multiple Airlines
Deal found 1/27$1,186
This Booking.com deal was found by Cheapflights users on 1/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/136:30 am
BFS
-
SEA
2 stops22h 46m
Multiple Airlines
Fri 3/204:10 pm
SEA
-
BFS
2 stops22h 50m
Multiple Airlines
Deal found 1/27$1,204

Find flight deals from Belfast Intl to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Belfast Intl (BFS) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 29, 2026.

Round-trip from

$1,204
(Booking.com)

One-way from

$583
(Kiwi.com)
From Belfast Intl to Seattle/Tacoma Intl
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One-way flight from Belfast Intl to Seattle/Tacoma Intl
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Belfast Intl to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 29, 2026.
Use the filters below to find and compare flights from Belfast Intl Airport to Seattle that are best for you.

Fly from

Belfast Intl

Fly to

Seattle

Route

Depart

Return

Price

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 3/13

6:30 am-10:16 pm

2 stops22h 46m

Seattle/Tacoma Intl

Fri 3/20

4:10 pm-10:00 pm

2 stops22h 50m

$1,204

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sat 2/7

11:10 pm-7:55 pm

3 stops52h 45m

$583

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

Best time to book a flight from Belfast Intl to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Belfast Intl with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Related info for your journey

Find useful and relevant information for your journey from Belfast Intl to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Seattle from Belfast Intl?

    Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly into when you book flights from Belfast Intl to Seattle. 0 airlines have flights to Seattle/Tacoma Intl from Belfast Intl on a regular basis. Booking flights from Belfast Intl to Seattle/Tacoma Intl should not be difficult; the airport handles an average of 0 inbound flights from Belfast Intl per day.

  • Can I find deals for flights from Belfast Intl to Seattle that include hotel bookings?

    Yes. In addition to deals on Belfast Intl to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Belfast Intl to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Belfast Intl to Seattle.

  • Can I find deals for business class flights from Belfast Intl to Seattle?

    Yes. Cheapflights offers flight deals from Belfast Intl to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
SeaTac
Lakewood
Ocean Shores
Olympia
Lynnwood
Lacey
Edmonds
Renton
Puyallup
Kirkland
Kent
Tukwila
Fife
Aberdeen
Shoreline
Marysville
Centralia
Federal Way
Chehalis

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Alternative routes for Belfast Intl to Seattle

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