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Cheap flights from Seattle to Belfast from £179

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Belfast departing on 16/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags
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Find the cheapest flights from Seattle to Belfast

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
19:00 - 21:30
SEA
-
BFS
18h 30m
3 stops
Multiple Airlines Logo
21:05 - 09:40
BFS
-
SEA
44h 35m
3 stops
£619Multiple Airlines
Thu, 7 May - Wed, 20 May
Multiple Airlines Logo
15:40 - 23:00
SEA
-
BFS
23h 20m
3 stops
Multiple Airlines Logo
22:10 - 09:40
BFS
-
SEA
43h 30m
3 stops
£629Multiple Airlines
Thu, 16 Apr - Sun, 3 May
British Airways Logo
20:20 - 18:55
SEA
-
BHD
14h 35m
1 stop
British Airways Logo
09:40 - 18:25
BHD
-
SEA
16h 45m
1 stop
£629British Airways
Tue, 1 Sep - Tue, 22 Sep
Multiple Airlines Logo
19:00 - 23:05
SEA
-
BFS
20h 05m
2 stops
Multiple Airlines Logo
07:35 - 17:55
BFS
-
SEA
18h 20m
2 stops
£650Multiple Airlines
Thu, 7 May - Wed, 20 May
Multiple Airlines Logo
15:40 - 21:40
SEA
-
BFS
22h 00m
3 stops
Multiple Airlines Logo
22:00 - 09:40
BFS
-
SEA
43h 40m
3 stops
£653Multiple Airlines
Thu, 16 Apr - Sun, 3 May
Multiple Airlines Logo
19:00 - 23:05
SEA
-
BFS
20h 05m
2 stops
Multiple Airlines Logo
21:05 - 09:40
BFS
-
SEA
44h 35m
3 stops
£656Multiple Airlines
Thu, 7 May - Wed, 20 May
British Airways Logo
20:20 - 20:35
SEA
-
BHD
16h 15m
1 stop
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
£665British Airways
Wed, 2 Sep - Sun, 6 Sep
British Airways Logo
20:20 - 17:40
SEA
-
BHD
13h 20m
1 stop
British Airways Logo
20:10 - 11:35
BHD
-
SEA
23h 25m
1 stop
£673British Airways
Sun, 12 Apr - Sun, 19 Apr
Multiple Airlines Logo
15:40 - 23:00
SEA
-
BFS
23h 20m
3 stops
Multiple Airlines Logo
06:10 - 09:40
BFS
-
SEA
35h 30m
2 stops
£682Multiple Airlines
Thu, 16 Apr - Sun, 3 May
KLM Logo
07:15 - 09:20
SEA
-
BHD
18h 05m
2 stops
KLM Logo
09:50 - 11:42
BHD
-
SEA
33h 52m
1 stop
£704KLM
Thu, 7 May - Wed, 20 May

British Airways flights from Seattle to Belfast

Our best British Airways deals on Seattle to Belfast flight tickets
British Airways
1 Sept
SEA20:20Seattle/Tacoma Intl
14h 35m
1 stop
BHD18:55Belfast City
22 Sept
BHD09:40Belfast City
16h 45m
1 stop
SEA18:25Seattle/Tacoma Intl
£629
British Airways
2 Sept
SEA20:20Seattle/Tacoma Intl
16h 15m
1 stop
BHD20:35Belfast City
6 Sept
BHD06:30Belfast City
13h 05m
1 stop
SEA11:35Seattle/Tacoma Intl
£665
British Airways
12 Apr
SEA20:20Seattle/Tacoma Intl
13h 20m
1 stop
BHD17:40Belfast City
19 Apr
BHD20:10Belfast City
23h 25m
1 stop
SEA11:35Seattle/Tacoma Intl
£673

American Airlines flights from Seattle to Belfast

Our best American Airlines deals on Seattle to Belfast flight tickets
American Airlines
16 Apr
SEA13:19Seattle/Tacoma Intl
18h 11m
2 stops
BHD15:30Belfast City
3 May
BHD11:00Belfast City
19h 38m
2 stops
SEA22:38Seattle/Tacoma Intl
£734
American Airlines
2 Sept
SEA15:10Seattle/Tacoma Intl
16h 30m
2 stops
BHD15:40Belfast City
6 Sept
BHD11:00Belfast City
19h 20m
2 stops
SEA22:20Seattle/Tacoma Intl
£750

momondo Fare Finder

 
Customise your flight search to find flights from Seattle to Belfast 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, momondo users made 279,928 searches. Data last updated 19 March 2026.
Use the filters below to find and compare flights from Seattle to Belfast that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 7/5

19:00-21:30

3 stops18h 30m

Belfast Intl

Wed 20/5

21:05-09:40

3 stops44h 35m

£619

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 16/4

15:40-23:00

3 stops23h 20m

Belfast Intl

Sun 3/5

22:10-09:40

3 stops43h 30m

£629

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 1/9

20:20-18:55

1 stop14h 35m

Belfast City

Tue 22/9

09:40-18:25

1 stop16h 45m

£629

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 7/5

19:00-23:05

2 stops20h 05m

Belfast Intl

Wed 20/5

07:35-17:55

2 stops18h 20m

£650

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 16/4

15:40-21:40

3 stops22h 00m

Belfast Intl

Sun 3/5

22:00-09:40

3 stops43h 40m

£653

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 7/5

19:00-23:05

2 stops20h 05m

Belfast Intl

Wed 20/5

21:05-09:40

3 stops44h 35m

£656
Fastest return journey

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 2/9

20:20-20:35

1 stop16h 15m

Belfast City

Sun 6/9

06:30-11:35

1 stop13h 05m

£665

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 12/4

20:20-17:40

1 stop13h 20m

Belfast City

Sun 19/4

20:10-11:35

1 stop23h 25m

£673

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 16/4

15:40-23:00

3 stops23h 20m

Belfast Intl

Sun 3/5

06:10-09:40

2 stops35h 30m

£682

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Thu 7/5

07:15-09:20

2 stops18h 05m

Belfast City

Wed 20/5

09:50-11:42

1 stop33h 52m

£704

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Belfast from

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 40m

Direct flights

None
The fastest flight from Seattle to Belfast takes 12h 40m
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 40m 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.

An easier way to manage your Belfast trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
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Find better results for your trip to the United Kingdom

Fly into one of these airports located in Belfast

Airports listed have a maximum distance of 12.2 mi from Belfast
Belfast Intl Airport
Belfast City Airport