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.

£231 Cheap Flights from Seattle to Belfast in 2025/26

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Find the cheapest flights from Seattle to Belfast

Round-trip

One-way

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Enter your travel dates to find the best prices.

13:35 - 11:10

SEA

BHD

13h 35m1 stop

12:25 - 17:55

BHD

SEA

12h 30m1 stop

£448British Airways

Sat, 7 Mar - Wed, 18 Mar

18:50 - 19:40

SEA

BHD

16h 50m1 stop

10:00 - 17:55

BHD

SEA

14h 55m1 stop

£451British Airways

Sat, 7 Mar - Tue, 17 Mar

14:35 - 22:00

SEA

BFS

23h 25m2 stops

08:05 - 17:00

BFS

SEA

16h 55m2 stops

£451Multiple Airlines

Fri, 30 Jan - Fri, 6 Feb

07:15 - 14:15

SEA

BHD

23h 00m2 stops

19:25 - 17:55

BHD

SEA

29h 30m1 stop

£463British Airways

Sat, 7 Mar - Tue, 17 Mar

07:15 - 16:45

SEA

BHD

25h 30m2 stops

06:35 - 21:54

BHD

SEA

22h 19m2 stops

£465British Airways

Sat, 7 Mar - Tue, 17 Mar

13:35 - 10:30

SEA

BHD

12h 55m1 stop

11:25 - 16:55

BHD

SEA

13h 30m1 stop

£466British Airways

Fri, 30 Jan - Tue, 3 Feb

14:35 - 16:10

SEA

BFS

17h 35m2 stops

07:55 - 17:00

BFS

SEA

17h 05m2 stops

£498Multiple Airlines

Wed, 28 Jan - Wed, 4 Feb

14:35 - 22:20

SEA

BFS

23h 45m2 stops

06:30 - 17:00

BFS

SEA

18h 30m2 stops

£507Multiple Airlines

Thu, 29 Jan - Thu, 5 Feb

20:20 - 17:45

SEA

BHD

13h 25m1 stop

06:50 - 11:35

BHD

SEA

12h 45m1 stop

£593British Airways

Sun, 26 Apr - Sun, 10 May

17:45 - 19:15

SEA

BHD

17h 30m2 stops

06:35 - 11:30

BHD

SEA

12h 55m1 stop

£615British Airways

Fri, 30 Jan - Tue, 3 Feb

British Airways flights from Seattle to Belfast

Our best British Airways deals on Seattle to Belfast flight tickets

British Airways

7 Mar

SEA13:35Seattle/Tacoma Intl

13h 35m

1 stop

BHD11:10Belfast City

18 Mar

BHD12:25Belfast City

12h 30m

1 stop

SEA17:55Seattle/Tacoma Intl

£448

Find similar

British Airways

7 Mar

SEA18:50Seattle/Tacoma Intl

16h 50m

1 stop

BHD19:40Belfast City

17 Mar

BHD10:00Belfast City

14h 55m

1 stop

SEA17:55Seattle/Tacoma Intl

£451

Find similar

British Airways

7 Mar

SEA07:15Seattle/Tacoma Intl

23h 00m

2 stops

BHD14:15Belfast City

17 Mar

BHD19:25Belfast City

29h 30m

1 stop

SEA17:55Seattle/Tacoma Intl

£463

Find similar

Aer Lingus flights from Seattle to Belfast

Our best Aer Lingus deals on Seattle to Belfast flight tickets

Aer Lingus

18 Feb

SEA20:05Seattle/Tacoma Intl

16h 10m

2 stops

BHD20:15Belfast City

23 Feb

BHD06:55Belfast City

19h 25m

2 stops

SEA18:20Seattle/Tacoma Intl

£2,756

Find similar

Aer Lingus

18 Feb

SEA18:50Seattle/Tacoma Intl

16h 20m

1 stop

BHD19:10Belfast City

23 Feb

BHD06:55Belfast City

19h 25m

2 stops

SEA18:20Seattle/Tacoma Intl

£2,769

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 7/3

13:35-11:10

1 stop13h 35m

Belfast City

Wed 18/3

12:25-17:55

1 stop12h 30m

£448

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 7/3

18:50-19:40

1 stop16h 50m

Belfast City

Tue 17/3

10:00-17:55

1 stop14h 55m

£451

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Fri 30/1

14:35-22:00

2 stops23h 25m

Belfast Intl

Fri 6/2

08:05-17:00

2 stops16h 55m

£451

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 7/3

07:15-14:15

2 stops23h 00m

Belfast City

Tue 17/3

19:25-17:55

1 stop29h 30m

£463

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 7/3

07:15-16:45

2 stops25h 30m

Belfast City

Tue 17/3

06:35-21:54

2 stops22h 19m

£465

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Fri 30/1

13:35-10:30

1 stop12h 55m

Belfast City

Tue 3/2

11:25-16:55

1 stop13h 30m

£466

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Wed 28/1

14:35-16:10

2 stops17h 35m

Belfast Intl

Wed 4/2

07:55-17:00

2 stops17h 05m

£498

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 29/1

14:35-22:20

2 stops23h 45m

Belfast Intl

Thu 5/2

06:30-17:00

2 stops18h 30m

£507

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 26/4

20:20-17:45

1 stop13h 25m

Belfast City

Sun 10/5

06:50-11:35

1 stop12h 45m

£593

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Fri 30/1

17:45-19:15

2 stops17h 30m

Belfast City

Tue 3/2

06:35-11:30

1 stop12h 55m

£615

Flights are sorted by cheapest return flights first.

Showing 1-10 of 15 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

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

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 55m
Direct flights	None

The fastest flight from Seattle to Belfast takes 12h 55m

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 55m 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.