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 November 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.

£294 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.

06:35 - 13:14BHD-SEA

38h 39m2 stops

14:04 - 16:05SEA-BHD

42h 01m2 stops

£630American Airlines

Find Deal

Wed, 21 Jan - Sun, 25 Jan

09:15 - 13:14BHD-SEA

35h 59m2 stops

14:04 - 10:40SEA-BHD

36h 36m2 stops

£643American Airlines

Find Deal

Wed, 21 Jan - Sun, 25 Jan

09:05 - 11:30BHD-SEA

34h 25m1 stop

18:50 - 16:05SEA-BHD

13h 15m1 stop

£656American Airlines

Find Deal

Thu, 29 Jan - Mon, 2 Feb

10:40 - 11:30BHD-SEA

32h 50m1 stop

18:50 - 16:05SEA-BHD

13h 15m1 stop

£659American Airlines

Find Deal

Thu, 29 Jan - Mon, 2 Feb

09:15 - 16:55BHD-SEA

15h 40m1 stop

18:50 - 16:50SEA-BHD

14h 00m1 stop

£659British Airways

Find Deal

Wed, 21 Jan - Sun, 25 Jan

06:35 - 22:20BHD-SEA

23h 45m2 stops

10:09 - 14:15SEA-BHD

20h 06m2 stops

£660American Airlines

Find Deal

Thu, 29 Jan - Mon, 2 Feb

12:25 - 16:55BHD-SEA

12h 30m1 stop

08:04 - 10:20SEA-BHD

18h 16m2 stops

£661British Airways

Find Deal

Wed, 21 Jan - Sun, 25 Jan

11:05 - 22:20BHD-SEA

19h 15m2 stops

10:09 - 16:05SEA-BHD

21h 56m2 stops

£663American Airlines

Find Deal

Thu, 29 Jan - Mon, 2 Feb

12:45 - 22:16BFS-SEA

41h 31m3 stops

14:35 - 22:20SEA-BFS

23h 45m3 stops

£1,457Multiple Airlines

Find Deal

Sat, 3 Jan - Sat, 10 Jan

22:25 - 13:20BFS-SEA

22h 55m2 stops

14:35 - 21:40SEA-BFS

23h 05m2 stops

£1,645Multiple Airlines

Find Deal

Sat, 3 Jan - Sat, 10 Jan

American Airlines flights from Belfast to Seattle

Our best American Airlines deals on Belfast to Seattle flight tickets

American Airlines

21 Jan

BHD06:35Belfast City

38h 39m

2 stops

SEA13:14Seattle/Tacoma Intl

25 Jan

SEA14:04Seattle/Tacoma Intl

42h 01m

2 stops

BHD16:05Belfast City

£630

Find similar

American Airlines

21 Jan

BHD09:15Belfast City

35h 59m

2 stops

SEA13:14Seattle/Tacoma Intl

25 Jan

SEA14:04Seattle/Tacoma Intl

36h 36m

2 stops

BHD10:40Belfast City

£643

Find similar

American Airlines

29 Jan

BHD09:05Belfast City

34h 25m

1 stop

SEA11:30Seattle/Tacoma Intl

2 Feb

SEA18:50Seattle/Tacoma Intl

13h 15m

1 stop

BHD16:05Belfast City

£656

Find similar

British Airways flights from Belfast to Seattle

Our best British Airways deals on Belfast to Seattle flight tickets

British Airways

21 Jan

BHD09:15Belfast City

15h 40m

1 stop

SEA16:55Seattle/Tacoma Intl

25 Jan

SEA18:50Seattle/Tacoma Intl

14h 00m

1 stop

BHD16:50Belfast City

£659

Find similar

British Airways

21 Jan

BHD12:25Belfast City

12h 30m

1 stop

SEA16:55Seattle/Tacoma Intl

25 Jan

SEA08:04Seattle/Tacoma Intl

18h 16m

2 stops

BHD10:20Belfast City

£661

Find similar

Fly from

Fly to

Route

Depart

Return

Price

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 21/1

06:35-13:14

2 stops38h 39m

Seattle/Tacoma Intl

Sun 25/1

14:04-16:05

2 stops42h 01m

£630

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 21/1

09:15-13:14

2 stops35h 59m

Seattle/Tacoma Intl

Sun 25/1

14:04-10:40

2 stops36h 36m

£643

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 29/1

09:05-11:30

1 stop34h 25m

Seattle/Tacoma Intl

Mon 2/2

18:50-16:05

1 stop13h 15m

£656

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 29/1

10:40-11:30

1 stop32h 50m

Seattle/Tacoma Intl

Mon 2/2

18:50-16:05

1 stop13h 15m

£659

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 21/1

09:15-16:55

1 stop15h 40m

Seattle/Tacoma Intl

Sun 25/1

18:50-16:50

1 stop14h 00m

£659

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 29/1

06:35-22:20

2 stops23h 45m

Seattle/Tacoma Intl

Mon 2/2

10:09-14:15

2 stops20h 06m

£660

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 21/1

12:25-16:55

1 stop12h 30m

Seattle/Tacoma Intl

Sun 25/1

08:04-10:20

2 stops18h 16m

£661

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 29/1

11:05-22:20

2 stops19h 15m

Seattle/Tacoma Intl

Mon 2/2

10:09-16:05

2 stops21h 56m

£663

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sat 3/1

12:45-22:16

3 stops41h 31m

Seattle/Tacoma Intl

Sat 10/1

14:35-22:20

3 stops23h 45m

£1,457

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sat 3/1

22:25-13:20

2 stops22h 55m

Seattle/Tacoma Intl

Sat 10/1

14:35-21:40

2 stops23h 05m

£1,645

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 is the most popular carrier 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.

Search flight deals

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 November 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 £450	Free Cancellation	Rating 6.7 7,533 reviews		Search British Airways flights
American Airlines	PriceFrom £575	Free Cancellation	Rating 7.2 11,047 reviews		Search American Airlines flights

Fife

Renton

SeaTac

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Can I find flights from Belfast to Seattle with flexible booking policies on momondo?

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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I’m not ready to book a flight from Belfast to Seattle right now. Can momondo alert me if prices change?

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.