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$669+ Cheap flights from Belfast 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 7/8. Fares are subject to change and may not be available on all flights or dates of travel.
BHD — SEA
Jul 29 — Aug 51
Wed 7/29
Wed 8/5
1 adult, Economy
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Cheap flight deals from Belfast to Seattle

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

This British Airways deal was found by Cheapflights users on 6/24. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/247:30 pm
BHD
-
SEA
1 stop24h 05m
British Airways
Sun 9/276:15 am
SEA
-
BHD
2 stops20h 15m
British Airways
Deal found 6/24$798
This British Airways deal was found by Cheapflights users on 6/24. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/37:00 am
BHD
-
SEA
2 stops17h 55m
British Airways
Mon 12/711:22 am
SEA
-
BHD
2 stops18h 53m
British Airways
Deal found 6/24$830
This Mytrip deal was found by Cheapflights users on 6/26. 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 7/168:20 am
BFS
-
SEA
3 stops44h 40m
Multiple Airlines
Wed 7/223:40 pm
SEA
-
BFS
3 stops22h 40m
Multiple Airlines
Deal found 6/26$861
This Expedia deal was found by Cheapflights users on 6/27. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/108:35 pm
BHD
-
SEA
1 stop23h 00m
British Airways
Thu 10/18:20 pm
SEA
-
BHD
1 stop14h 25m
British Airways
Deal found 6/27$868
This Expedia deal was found by Cheapflights users on 6/27. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/109:50 am
BHD
-
SEA
2 stops21h 30m
KLM
Thu 10/18:59 pm
SEA
-
BHD
2 stops35h 56m
KLM
Deal found 6/27$924
This Delta deal was found by Cheapflights users on 6/28. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/109:50 am
BHD
-
SEA
2 stops22h 05m
Delta
Thu 10/17:15 am
SEA
-
BHD
2 stops18h 05m
Delta
Deal found 6/28$929
This Mytrip deal was found by Cheapflights users on 6/27. 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 9/106:10 am
BFS
-
SEA
2 stops22h 30m
Multiple Airlines
Thu 10/17:00 pm
SEA
-
BFS
2 stops20h 05m
Multiple Airlines
Deal found 6/27$942
This SmartFares deal was found by Cheapflights users on 6/26. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/166:30 am
BHD
-
SEA
1 stop13h 05m
British Airways
Wed 7/228:20 pm
SEA
-
BHD
1 stop15h 30m
British Airways
Deal found 6/26$952
This Mytrip deal was found by Cheapflights users on 6/29. 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 8/136:40 am
BFS
-
SEA
3 stops35h 00m
Multiple Airlines
Thu 8/207:00 pm
SEA
-
BFS
3 stops20h 00m
Multiple Airlines
Deal found 6/29$1,060
This Mytrip deal was found by Cheapflights users on 6/25. 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.
Sun 8/99:05 pm
BFS
-
SEA
2 stops27h 05m
Multiple Airlines
Sun 8/165:40 pm
SEA
-
BFS
2 stops18h 35m
Multiple Airlines
Deal found 6/25$1,207

Find flight deals from Belfast to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Belfast (BF1) 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 June 29, 2026.

Round-trip from

$734
(Expedia)

One-way from

$669
(Kiwi.com)
From Belfast to Seattle/Tacoma Intl
Search Deals
One-way flight from Belfast to Seattle/Tacoma Intl
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Belfast 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 June 29, 2026.
Use the filters below to find and compare flights from Belfast to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 10/22

6:30 am-11:35 am

1 stop13h 05m

Seattle/Tacoma Intl

Mon 10/26

7:50 pm-6:35 pm

1 stop15h 45m

$734

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 9/24

7:30 pm-11:35 am

1 stop24h 05m

Seattle/Tacoma Intl

Sun 9/27

6:15 am-10:30 am

2 stops20h 15m

$798

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 12/3

6:35 am-4:55 pm

1 stop18h 20m

Seattle/Tacoma Intl

Mon 12/7

6:50 pm-6:35 pm

1 stop15h 45m

$798

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 7/16

8:20 am-9:00 pm

3 stops44h 40m

Seattle/Tacoma Intl

Wed 7/22

3:40 pm-10:20 pm

3 stops22h 40m

$861

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 9/10

8:35 pm-11:35 am

1 stop23h 00m

Seattle/Tacoma Intl

Thu 10/1

1:38 pm-3:30 pm

2 stops17h 52m

$900

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 9/10

9:50 am-11:55 pm

2 stops22h 05m

Seattle/Tacoma Intl

Thu 10/1

7:15 am-9:20 am

2 stops18h 05m

$929

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 9/10

6:10 am-8:40 pm

2 stops22h 30m

Seattle/Tacoma Intl

Thu 10/1

7:00 pm-11:05 pm

2 stops20h 05m

$942

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 8/13

6:40 am-9:40 am

3 stops35h 00m

Seattle/Tacoma Intl

Thu 8/20

7:00 pm-11:00 pm

3 stops20h 00m

$1,060

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sun 8/9

9:05 pm-4:10 pm

2 stops27h 05m

Seattle/Tacoma Intl

Sun 8/16

5:40 pm-8:15 pm

2 stops18h 35m

$1,207
Cheapest one-way

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 7/8

10:45 pm-9:00 pm

3 stops54h 15m

$669

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/28

Showing 1-10 of 13 resultsSorted by cheapest first
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Best time to book a flight from Belfast to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Belfast 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.

Cheapflights Insights

Everything you need to know about your flight from Belfast to Seattle
No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Belfast 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?

    Seattle/Tacoma Intl (SEA) is the airport you will fly into if you book a flight from Belfast to Seattle. You should not have trouble finding flights to Seattle/Tacoma Intl from Belfast; the airport handles an average of 0 inbound flights from Belfast per day. You should also have plenty of airline options to choose from since 0 airlines have flights to the Seattle airport from Belfast. It is only a 11.4 mi journey from Seattle/Tacoma Intl (SEA) to Seattle’s city center.

  • How long is the flight from Belfast to Seattle?

    Departing from Belfast to Seattle will take you 13h 05m. Airlines will cover a distance of 4472 mi.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Belfast 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
SeaTac
Tacoma
Lacey
Leavenworth
Olympia
Ocean Shores
Edmonds
Snoqualmie
Tumwater
Tukwila
Renton
Kent
Lynnwood
Ellensburg
Fife
Marysville
Lakewood
Issaquah
Shoreline
Centralia

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