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

British Airways is the most popular carrier operating from Seattle/Tacoma Intl to Belfast

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

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

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

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Belfast.

What documentation or ID do you need to fly to Belfast?

The travel and health documents you'll need for your trip to Belfast may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Belfast. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

£252 Cheap Flights from Seattle to Belfast in 2026

Q: What is the typical price of a round-trip flight between Seattle and Belfast?

Prices are currently low for flights on this route. Typical prices usually range from £598 to £720. The lowest price recently found on this route was £453.

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Find the cheapest flights from Seattle to Belfast

Round-trip

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

18:50 - 16:45

SEA

BHD

13h 55m

1 stop

06:35 - 17:55

BHD

SEA

18h 20m

1 stop

£453British Airways

Sat, 7 Mar - Wed, 18 Mar

18:50 - 19:40

SEA

BHD

16h 50m

1 stop

08:45 - 17:55

BHD

SEA

16h 10m

1 stop

£454British Airways

Sat, 7 Mar - Tue, 17 Mar

13:35 - 14:15

SEA

BHD

16h 40m

1 stop

11:25 - 00:24

BHD

SEA

19h 59m

2 stops

£456British Airways

Sat, 7 Mar - Tue, 17 Mar

13:29 - 18:45

SEA

BHD

21h 16m

2 stops

06:30 - 11:35

BHD

SEA

13h 05m

1 stop

£472British Airways

Sun, 3 May - Tue, 12 May

13:29 - 18:45

SEA

BHD

21h 16m

2 stops

06:30 - 22:26

BHD

SEA

23h 56m

2 stops

£474British Airways

Sun, 3 May - Tue, 12 May

17:30 - 16:55

SEA

BHD

15h 25m

1 stop

09:50 - 16:30

BHD

SEA

14h 40m

1 stop

£484Multiple Airlines

Sun, 3 May - Tue, 12 May

18:50 - 07:30

SEA

BHD

28h 40m

1 stop

17:35 - 16:55

BHD

SEA

31h 20m

1 stop

£538British Airways

Wed, 25 Feb - Sun, 1 Mar

05:30 - 15:30

SEA

BHD

26h 00m

2 stops

06:30 - 11:35

BHD

SEA

13h 05m

1 stop

£546British Airways

Fri, 3 Apr - Fri, 10 Apr

05:30 - 18:10

SEA

BHD

28h 40m

2 stops

18:30 - 11:35

BHD

SEA

25h 05m

1 stop

£562British Airways

Fri, 3 Apr - Mon, 20 Apr

15:00 - 20:25

SEA

BFS

22h 25m

2 stops

09:05 - 13:10

BFS

SEA

35h 05m

2 stops

£597Multiple Airlines

Thu, 12 Mar - Thu, 19 Mar

British Airways flights from Seattle to Belfast

Our best British Airways deals on Seattle to Belfast flight tickets

British Airways

7 Mar

SEA18:50Seattle/Tacoma Intl

13h 55m

1 stop

BHD16:45Belfast City

18 Mar

BHD06:35Belfast City

18h 20m

1 stop

SEA17:55Seattle/Tacoma Intl

£453

British Airways

7 Mar

SEA18:50Seattle/Tacoma Intl

16h 50m

1 stop

BHD19:40Belfast City

17 Mar

BHD08:45Belfast City

16h 10m

1 stop

SEA17:55Seattle/Tacoma Intl

£454

British Airways

7 Mar

SEA13:35Seattle/Tacoma Intl

16h 40m

1 stop

BHD14:15Belfast City

17 Mar

BHD11:25Belfast City

19h 59m

2 stops

SEA00:24Seattle/Tacoma Intl

£456

Aer Lingus flights from Seattle to Belfast

Our best Aer Lingus deals on Seattle to Belfast flight tickets

Aer Lingus

23 Mar

SEA21:05Seattle/Tacoma Intl

29h 10m

2 stops

BHD09:15Belfast City

27 Mar

BHD10:35Belfast City

15h 45m

2 stops

SEA19:20Seattle/Tacoma Intl

£819

Aer Lingus

15 Jul

SEA20:20Seattle/Tacoma Intl

16h 15m

1 stop

BHD20:35Belfast City

18 Jul

BHD18:00Belfast City

31h 10m

2 stops

SEA17:10Seattle/Tacoma Intl

£5,061

Aer Lingus

15 Jul

SEA18:55Seattle/Tacoma Intl

14h 50m

2 stops

BHD17:45Belfast City

18 Jul

BHD18:00Belfast City

31h 10m

2 stops

SEA17:10Seattle/Tacoma Intl

£5,077

Fly from

Fly to

Route

Depart

Return

Price

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 7/3

18:50-16:45

1 stop13h 55m

Belfast City

Wed 18/3

06:35-17:55

1 stop18h 20m

£453

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 7/3

18:50-19:40

1 stop16h 50m

Belfast City

Tue 17/3

08:45-17:55

1 stop16h 10m

£454

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 7/3

13:35-14:15

1 stop16h 40m

Belfast City

Tue 17/3

11:25-00:24

2 stops19h 59m

£456

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 3/5

13:29-18:45

2 stops21h 16m

Belfast City

Tue 12/5

06:30-11:35

1 stop13h 05m

£472

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 3/5

13:29-18:45

2 stops21h 16m

Belfast City

Tue 12/5

06:30-22:26

2 stops23h 56m

£474

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 3/5

17:30-16:55

1 stop15h 25m

Belfast City

Tue 12/5

09:50-16:30

1 stop14h 40m

£484

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 25/2

18:50-07:30

1 stop28h 40m

Belfast City

Sun 1/3

17:35-16:55

1 stop31h 20m

£538

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Fri 3/4

05:30-15:30

2 stops26h 00m

Belfast City

Fri 10/4

06:30-11:35

1 stop13h 05m

£546

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Fri 3/4

05:30-18:10

2 stops28h 40m

Belfast City

Mon 20/4

18:30-11:35

1 stop25h 05m

£562

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 12/3

15:00-20:25

2 stops22h 25m

Belfast Intl

Thu 19/3

09:05-13:10

2 stops35h 05m

£597

Flights are sorted by cheapest return flights first.

Showing 1-10 of 17 resultsSorted by cheapest first

How to get the cheapest flight ticket from Seattle to Belfast

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

Prices

Airlines

What is the typical price of a round-trip flight between Seattle and Belfast?

Cheap Seattle to Belfast flight deals and tips

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

Fastest flight time	12h 35m
Direct flights	None

The fastest flight from Seattle to Belfast takes 12h 35m

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

Search flight deals

How far is Seattle/Tacoma Intl to Belfast by plane?
Seattle/Tacoma Intl and Belfast are 4463.0 mi apart from one another. 12h 35m is a normal flight duration for this route.
When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Belfast?
Prices for flights from Seattle/Tacoma Intl Airport to Belfast are refreshed on a daily basis.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Belfast?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Belfast.
What documentation or ID do you need to fly to Belfast?
The travel and health documents you'll need for your trip to Belfast may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Belfast. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Belfast?

Finding the right flight to Belfast from Seattle is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Belfast quick and easy, saving you time and money.

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

Flights from Seattle to Belfast with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Seattle to Belfast?

momondo provides multiple filters to help you find the best flight to Belfast from Seattle. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

If you are simply researching potential flights to Belfast, momondo offers a useful price alert feature which will track prices for flights to Belfast from Seattle and alert you when they change.