When did momondo last update prices for flights from Belfast to Seattle/Tacoma Intl Airport?

Prices for flights from Belfast to Seattle/Tacoma Intl Airport are refreshed on a daily basis.

How many operators does momondo search for flights from Belfast to Seattle/Tacoma Intl Airport?

As of October 2025, there are 2 operators available to choose from for flights from Belfast to Seattle/Tacoma Intl Airport.

How old do you have to be to fly from Belfast to Seattle/Tacoma Intl Airport?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Belfast to Seattle/Tacoma Intl Airport.

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

The travel and health documents required for your trip to Seattle/Tacoma Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

£332 Cheap Flights from Belfast to Seattle in 2025/26

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Find the cheapest flights from Belfast to Seattle

Round-trip

One-way

Cheap return flights

Enter your travel dates to find the best prices.

06:00 - 17:00BFS-SEA

43h 00m2 stops

14:35 - 21:35SEA-BFS

23h 00m2 stops

£539Multiple Airlines

Find Deal

Tue, 11 Nov - Thu, 20 Nov

06:00 - 16:50BFS-SEA

18h 50m1 stop

16:48 - 21:35SEA-BFS

20h 47m1 stop

£616Multiple Airlines

Find Deal

Tue, 11 Nov - Thu, 20 Nov

11:30 - 11:30BHD-SEA

32h 00m1 stop

18:50 - 16:45SEA-BHD

13h 55m1 stop

£641American Airlines

Find Deal

Mon, 10 Nov - Tue, 25 Nov

09:15 - 16:55BHD-SEA

15h 40m1 stop

18:50 - 18:40SEA-BHD

15h 50m1 stop

£643British Airways

Find Deal

Wed, 12 Nov - Tue, 25 Nov

06:35 - 23:18BHD-SEA

24h 43m2 stops

11:42 - 14:15SEA-BHD

18h 33m2 stops

£646American Airlines

Find Deal

Mon, 10 Nov - Mon, 24 Nov

14:40 - 11:30BHD-SEA

28h 50m1 stop

18:50 - 10:20SEA-BHD

31h 30m1 stop

£650British Airways

Find Deal

Mon, 10 Nov - Wed, 26 Nov

06:35 - 23:18BHD-SEA

24h 43m2 stops

14:46 - 18:40SEA-BHD

19h 54m2 stops

£653American Airlines

Find Deal

Mon, 10 Nov - Tue, 25 Nov

17:20 - 11:45BHD-SEA

26h 25m1 stop

15:00 - 21:00SEA-BHD

22h 00m1 stop

£693KLM

Find Deal

Sun, 9 Nov - Mon, 24 Nov

17:20 - 11:45BHD-SEA

26h 25m1 stop

15:00 - 16:50SEA-BHD

17h 50m1 stop

£723Delta

Find Deal

Sun, 9 Nov - Mon, 24 Nov

06:30 - 17:00BHD-SEA

18h 30m2 stops

15:00 - 16:50SEA-BHD

17h 50m1 stop

£727KLM

Find Deal

Mon, 17 Nov - Sat, 29 Nov

American Airlines flights from Belfast to Seattle

Our best American Airlines deals on Belfast to Seattle flight tickets

American Airlines

10 Nov

BHD11:30Belfast City

32h 00m

1 stop

SEA11:30Seattle/Tacoma Intl

25 Nov

SEA18:50Seattle/Tacoma Intl

13h 55m

1 stop

BHD16:45Belfast City

£641

Find similar

American Airlines

10 Nov

BHD06:35Belfast City

24h 43m

2 stops

SEA23:18Seattle/Tacoma Intl

24 Nov

SEA11:42Seattle/Tacoma Intl

18h 33m

2 stops

BHD14:15Belfast City

£646

Find similar

American Airlines

10 Nov

BHD06:35Belfast City

24h 43m

2 stops

SEA23:18Seattle/Tacoma Intl

25 Nov

SEA14:46Seattle/Tacoma Intl

19h 54m

2 stops

BHD18:40Belfast City

£653

Find similar

British Airways flights from Belfast to Seattle

Our best British Airways deals on Belfast to Seattle flight tickets

British Airways

12 Nov

BHD09:15Belfast City

15h 40m

1 stop

SEA16:55Seattle/Tacoma Intl

25 Nov

SEA18:50Seattle/Tacoma Intl

15h 50m

1 stop

BHD18:40Belfast City

£643

Find similar

British Airways

10 Nov

BHD14:40Belfast City

28h 50m

1 stop

SEA11:30Seattle/Tacoma Intl

26 Nov

SEA18:50Seattle/Tacoma Intl

31h 30m

1 stop

BHD10:20Belfast City

£650

Find similar

British Airways

10 Nov

BHD19:25Belfast City

24h 05m

1 stop

SEA11:30Seattle/Tacoma Intl

19 Nov

SEA18:50Seattle/Tacoma Intl

28h 40m

1 stop

BHD07:30Belfast City

£658

Find similar

Fly from

Fly to

Route

Depart

Return

Price

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 11/11

06:00-17:00

2 stops43h 00m

Seattle/Tacoma Intl

Thu 20/11

14:35-21:35

2 stops23h 00m

£539

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 11/11

06:00-16:50

1 stop18h 50m

Seattle/Tacoma Intl

Thu 20/11

16:48-21:35

1 stop20h 47m

£616

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 10/11

11:30-11:30

1 stop32h 00m

Seattle/Tacoma Intl

Tue 25/11

18:50-16:45

1 stop13h 55m

£641

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 12/11

09:15-16:55

1 stop15h 40m

Seattle/Tacoma Intl

Tue 25/11

18:50-18:40

1 stop15h 50m

£643

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 10/11

06:35-23:18

2 stops24h 43m

Seattle/Tacoma Intl

Mon 24/11

11:42-14:15

2 stops18h 33m

£646

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 10/11

14:40-11:30

1 stop28h 50m

Seattle/Tacoma Intl

Wed 26/11

18:50-10:20

1 stop31h 30m

£650

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 10/11

06:35-23:18

2 stops24h 43m

Seattle/Tacoma Intl

Tue 25/11

14:46-18:40

2 stops19h 54m

£653

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sun 9/11

17:20-11:45

1 stop26h 25m

Seattle/Tacoma Intl

Mon 24/11

15:00-21:00

1 stop22h 00m

£693

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sun 9/11

17:20-11:45

1 stop26h 25m

Seattle/Tacoma Intl

Mon 24/11

15:00-16:50

1 stop17h 50m

£723

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 17/11

06:30-17:00

2 stops18h 30m

Seattle/Tacoma Intl

Sat 29/11

15:00-16:50

1 stop17h 50m

£727

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Belfast to Seattle

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Belfast to Seattle/Tacoma Intl?

British Airways, Finnair, and American Airlines are the most popular carriers operating from Belfast to Seattle/Tacoma Intl

Cheap Belfast to Seattle flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Belfast to Seattle

Direct flights	None

There are no direct flights from Belfast to Seattle. There are no popular flight routes from Belfast to Seattle.

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How far is Belfast to Seattle/Tacoma Intl by plane?
Seattle/Tacoma Intl is 4463.0 mi away from Belfast. By plane, this route typically takes 12h 30m.
When did momondo last update prices for flights from Belfast to Seattle/Tacoma Intl Airport?
Prices for flights from Belfast to Seattle/Tacoma Intl Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Belfast to Seattle/Tacoma Intl Airport?
As of October 2025, there are 2 operators available to choose from for flights from Belfast to Seattle/Tacoma Intl Airport.
How old do you have to be to fly from Belfast to Seattle/Tacoma Intl Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Belfast to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The travel and health documents required for your trip to Seattle/Tacoma Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Belfast to Seattle

Compare and see reviews for airlines that fly from Belfast to Seattle with momondo

Airline	Rating	Free Cancellation	Price
British Airways	PriceFrom £441	Free Cancellation	Rating 6.7 7,469 reviews		Search British Airways flights
American Airlines	PriceFrom £563	Free Cancellation	Rating 7.2 11,033 reviews		Search American Airlines flights

Fife

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SeaTac

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momondo does allow users to show only those flights to Seattle from Belfast which offer a flexible booking policy as well as other useful filters and features.

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Yes momondo offers price alerts on flights to Seattle from Belfast. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.