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Cheap flights from Seattle to Belfast from £296

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 21/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 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
15:40 - 23:15
SEA
-
BFS
23h 35m
3 stops
Multiple Airlines Logo
21:15 - 09:40
BFS
-
SEA
44h 25m
3 stops
£644Multiple Airlines
Wed, 26 Aug - Sat, 29 Aug
British Airways Logo
18:45 - 16:35
SEA
-
BHD
13h 50m
1 stop
British Airways Logo
19:25 - 11:25
BHD
-
SEA
24h 00m
1 stop
£660British Airways
Wed, 11 Nov - Mon, 16 Nov
Multiple Airlines Logo
15:40 - 20:20
SEA
-
BFS
20h 40m
3 stops
Multiple Airlines Logo
21:40 - 18:45
BFS
-
SEA
29h 05m
3 stops
£664Multiple Airlines
Sat, 29 Aug - Sat, 5 Sep
Multiple Airlines Logo
15:40 - 22:15
SEA
-
BFS
22h 35m
2 stops
Multiple Airlines Logo
21:40 - 18:45
BFS
-
SEA
29h 05m
3 stops
£666Multiple Airlines
Sat, 29 Aug - Sat, 5 Sep
Multiple Airlines Logo
19:00 - 22:15
SEA
-
BFS
19h 15m
2 stops
Multiple Airlines Logo
21:15 - 09:40
BFS
-
SEA
44h 25m
3 stops
£670Multiple Airlines
Tue, 25 Aug - Sat, 29 Aug
Multiple Airlines Logo
19:00 - 22:15
SEA
-
BFS
19h 15m
2 stops
Multiple Airlines Logo
06:20 - 20:40
BFS
-
SEA
22h 20m
2 stops
£674Multiple Airlines
Sat, 29 Aug - Sat, 5 Sep
British Airways Logo
08:11 - 10:15
SEA
-
BHD
18h 04m
2 stops
British Airways Logo
19:25 - 11:25
BHD
-
SEA
24h 00m
1 stop
£679British Airways
Wed, 11 Nov - Mon, 16 Nov
British Airways Logo
18:45 - 18:40
SEA
-
BHD
15h 55m
1 stop
British Airways Logo
09:05 - 16:50
BHD
-
SEA
15h 45m
1 stop
£681British Airways
Sun, 10 Jan - Thu, 14 Jan
British Airways Logo
18:45 - 18:40
SEA
-
BHD
15h 55m
1 stop
British Airways Logo
09:05 - 16:50
BHD
-
SEA
15h 45m
1 stop
£682British Airways
Sun, 10 Jan - Thu, 14 Jan
British Airways Logo
18:45 - 18:40
SEA
-
BHD
15h 55m
1 stop
British Airways Logo
09:05 - 16:50
BHD
-
SEA
15h 45m
1 stop
£682British Airways
Sun, 10 Jan - Thu, 14 Jan

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British Airways flights from Seattle to Belfast

Our best British Airways deals on Seattle to Belfast flight tickets
British Airways
11 Nov
SEA18:45Seattle/Tacoma Intl
13h 50m
1 stop
BHD16:35Belfast City
16 Nov
BHD19:25Belfast City
24h 00m
1 stop
SEA11:25Seattle/Tacoma Intl
£660
British Airways
11 Nov
SEA08:11Seattle/Tacoma Intl
18h 04m
2 stops
BHD10:15Belfast City
16 Nov
BHD19:25Belfast City
24h 00m
1 stop
SEA11:25Seattle/Tacoma Intl
£679
British Airways
10 Jan
SEA18:45Seattle/Tacoma Intl
15h 55m
1 stop
BHD18:40Belfast City
14 Jan
BHD09:05Belfast City
15h 45m
1 stop
SEA16:50Seattle/Tacoma Intl
£681

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 July 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

Wed 26/8

15:40-23:15

3 stops23h 35m

Belfast Intl

Sat 29/8

21:15-09:40

3 stops44h 25m

£644

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 11/11

18:45-16:35

1 stop13h 50m

Belfast City

Mon 16/11

19:25-11:25

1 stop24h 00m

£660

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 29/8

15:40-20:20

3 stops20h 40m

Belfast Intl

Sat 5/9

21:40-18:45

3 stops29h 05m

£664

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 29/8

15:40-22:15

2 stops22h 35m

Belfast Intl

Sat 5/9

21:40-18:45

3 stops29h 05m

£666

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 25/8

19:00-22:15

2 stops19h 15m

Belfast Intl

Sat 29/8

21:15-09:40

3 stops44h 25m

£670

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 29/8

19:00-22:15

2 stops19h 15m

Belfast Intl

Sat 5/9

06:20-20:40

2 stops22h 20m

£674

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 11/11

08:11-10:15

2 stops18h 04m

Belfast City

Mon 16/11

19:25-11:25

1 stop24h 00m

£679
Fastest return journey

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 10/1

18:45-18:40

1 stop15h 55m

Belfast City

Thu 14/1

09:05-16:50

1 stop15h 45m

£681

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 10/1

18:45-18:40

1 stop15h 55m

Belfast City

Thu 14/1

09:05-16:50

1 stop15h 45m

£682

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 10/1

18:45-18:40

1 stop15h 55m

Belfast City

Thu 14/1

09:05-16:50

1 stop15h 45m

£682

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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?

Delta and Air France are the most popular carriers 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

15h 05m

Direct flights

None
The fastest flight from Seattle to Belfast takes 15h 05m
There are no direct flights from Seattle to Belfast. There are no popular flight routes from Seattle to Belfast.
Search flight deals

Frequently asked questions about flying from Seattle to Belfast

  • How far is Seattle/Tacoma Intl to Belfast by plane?

    Seattle/Tacoma Intl and Belfast are 4463.0 mi apart from one another. 15h 05m 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