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Cheap flights from Seattle to Belfast from £599

1 adult
1 adult, Economy, 0 bags

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 - 22:25SEA  Seattle/Tacoma Intl-BFS Belfast Intl
19h 25m2 stops Reykjavik Keflavik Intl Amsterdam Schiphol
Multiple Airlines Logo
07:00 - 18:00BFS  Belfast Intl-SEA Seattle/Tacoma Intl
18h 00m2 stops Amsterdam Schiphol Reykjavik Keflavik Intl
£599Multiple Airlines
Thu, 15 Oct - Wed, 28 Oct
Multiple Airlines Logo
19:00 - 16:20SEA  Seattle/Tacoma Intl-BFS Belfast Intl
13h 20m2 stops Reykjavik Keflavik Intl Glasgow Intl
Multiple Airlines Logo
08:35 - 18:00BFS  Belfast Intl-SEA Seattle/Tacoma Intl
16h 25m2 stops Glasgow Intl Reykjavik Keflavik Intl
£627Multiple Airlines
Tue, 20 Oct - Tue, 27 Oct
British Airways Logo
18:45 - 16:50SEA  Seattle/Tacoma Intl-BHD Belfast City
14h 05m1 stop London Heathrow
British Airways Logo
06:30 - 16:50BHD  Belfast City-SEA Seattle/Tacoma Intl
18h 20m1 stop London Heathrow
£679British Airways
Sun, 17 Jan - Thu, 21 Jan
British Airways Logo
18:45 - 16:50SEA  Seattle/Tacoma Intl-BHD Belfast City
14h 05m1 stop London Heathrow
British Airways Logo
11:05 - 16:50BHD  Belfast City-SEA Seattle/Tacoma Intl
13h 45m1 stop London Heathrow
£680British Airways
Sun, 17 Jan - Thu, 21 Jan
Aer Lingus Logo
20:20 - 17:30SEA  Seattle/Tacoma Intl-BHD Belfast City
13h 10m1 stop London Heathrow
Aer Lingus Logo
09:35 - 18:25BHD  Belfast City-SEA Seattle/Tacoma Intl
16h 50m1 stop London Heathrow
£697Aer Lingus
Mon, 5 Oct - Thu, 22 Oct
Multiple Airlines Logo
15:40 - 22:30SEA  Seattle/Tacoma Intl-BFS Belfast Intl
22h 50m3 stops Reykjavik Keflavik Intl Kastrup Copenhagen Bristol
Multiple Airlines Logo
09:25 - 20:40BFS  Belfast Intl-SEA Seattle/Tacoma Intl
18h 15m2 stops London Gatwick Reykjavik Keflavik Intl
£706Multiple Airlines
Sun, 18 Oct - Sun, 25 Oct
British Airways Logo
20:20 - 19:25SEA  Seattle/Tacoma Intl-BHD Belfast City
15h 05m1 stop London Heathrow
British Airways Logo
12:45 - 18:25BHD  Belfast City-SEA Seattle/Tacoma Intl
13h 40m1 stop London Heathrow
£706British Airways
Mon, 5 Oct - Thu, 22 Oct
British Airways Logo
20:20 - 19:25SEA  Seattle/Tacoma Intl-BHD Belfast City
15h 05m1 stop London Heathrow
British Airways Logo
12:45 - 18:25BHD  Belfast City-SEA Seattle/Tacoma Intl
13h 40m1 stop London Heathrow
£707British Airways
Mon, 5 Oct - Thu, 22 Oct
Multiple Airlines Logo
19:00 - 16:20SEA  Seattle/Tacoma Intl-BFS Belfast Intl
13h 20m2 stops Reykjavik Keflavik Intl Glasgow Intl
Multiple Airlines Logo
17:05 - 18:00BFS  Belfast Intl-SEA Seattle/Tacoma Intl
31h 55m3 stops London Stansted Oslo Gardermoen Reykjavik Keflavik Intl
£714Multiple Airlines
Tue, 20 Oct - Tue, 27 Oct
American Airlines Logo
15:14 - 15:30SEA  Seattle/Tacoma Intl-BHD Belfast City
16h 16m2 stops Chicago O'Hare Intl London Heathrow
American Airlines Logo
14:20 - 11:35BHD  Belfast City-SEA Seattle/Tacoma Intl
29h 15m1 stop London Heathrow
£720American Airlines
Mon, 5 Oct - Thu, 22 Oct

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American Airlines flights from Seattle to Belfast

Our best American Airlines deals on Seattle to Belfast flight tickets
American Airlines
5 Oct
SEA15:14Seattle/Tacoma Intl
16h 16m
2 stops
BHD15:30Belfast City
22 Oct
BHD14:20Belfast City
29h 15m
1 stop
SEA11:35Seattle/Tacoma Intl
£720
American Airlines
5 Oct
SEA15:14Seattle/Tacoma Intl
16h 16m
2 stops
BHD15:30Belfast City
22 Oct
BHD14:20Belfast City
29h 15m
1 stop
SEA11:35Seattle/Tacoma Intl
£720

British Airways flights from Seattle to Belfast

Our best British Airways deals on Seattle to Belfast flight tickets
British Airways
17 Jan
SEA18:45Seattle/Tacoma Intl
14h 05m
1 stop
BHD16:50Belfast City
21 Jan
BHD06:30Belfast City
18h 20m
1 stop
SEA16:50Seattle/Tacoma Intl
£679
British Airways
17 Jan
SEA18:45Seattle/Tacoma Intl
14h 05m
1 stop
BHD16:50Belfast City
21 Jan
BHD11:05Belfast City
13h 45m
1 stop
SEA16:50Seattle/Tacoma Intl
£680
British Airways
5 Oct
SEA20:20Seattle/Tacoma Intl
15h 05m
1 stop
BHD19:25Belfast City
22 Oct
BHD12:45Belfast City
13h 40m
1 stop
SEA18:25Seattle/Tacoma Intl
£706

momondo Fare Finder

 
Use the filters below to find and compare flights from Seattle to Belfast that are best for you.

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Depart

Return

Price

Cheapest return flight

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Thu 15/10

19:00-22:25

2 stops19h 25m

Belfast Intl

Wed 28/10

07:00-18:00

2 stops18h 00m

£599

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Tue 20/10

19:00-16:20

2 stops13h 20m

Belfast Intl

Tue 27/10

08:35-18:00

2 stops16h 25m

£627

SeattleBelfast

SEA Seattle/Tacoma Intl - BHD Belfast City

SEABHD

Seattle/Tacoma Intl

Sun 17/1

18:45-16:50

1 stop14h 05m

Belfast City

Thu 21/1

06:30-16:50

1 stop18h 20m

£679
Fastest return journey

SeattleBelfast

SEA Seattle/Tacoma Intl - BHD Belfast City

SEABHD

Seattle/Tacoma Intl

Sun 17/1

18:45-16:50

1 stop14h 05m

Belfast City

Thu 21/1

11:05-16:50

1 stop13h 45m

£680

SeattleBelfast

SEA Seattle/Tacoma Intl - BHD Belfast City

SEABHD

Seattle/Tacoma Intl

Mon 5/10

20:20-17:30

1 stop13h 10m

Belfast City

Thu 22/10

09:35-18:25

1 stop16h 50m

£697

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Sun 18/10

15:40-22:30

3 stops22h 50m

Belfast Intl

Sun 25/10

09:25-20:40

2 stops18h 15m

£706

SeattleBelfast

SEA Seattle/Tacoma Intl - BHD Belfast City

SEABHD

Seattle/Tacoma Intl

Mon 5/10

20:20-19:25

1 stop15h 05m

Belfast City

Thu 22/10

12:45-18:25

1 stop13h 40m

£706

SeattleBelfast

SEA Seattle/Tacoma Intl - BHD Belfast City

SEABHD

Seattle/Tacoma Intl

Mon 5/10

20:20-19:25

1 stop15h 05m

Belfast City

Thu 22/10

12:45-18:25

1 stop13h 40m

£707

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Tue 20/10

19:00-16:20

2 stops13h 20m

Belfast Intl

Tue 27/10

17:05-18:00

3 stops31h 55m

£714

SeattleBelfast

SEA Seattle/Tacoma Intl - BHD Belfast City

SEABHD

Seattle/Tacoma Intl

Mon 5/10

15:14-15:30

2 stops16h 16m

Belfast City

Thu 22/10

14:20-11:35

1 stop29h 15m

£720

Flights are sorted by cheapest return flights first.

Sorted by cheapest first

Cheap Seattle to Belfast flight deals and tips

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

Best price found

£599

Fastest flight time

14h 05m

Direct flights

None
The best flight deal from Seattle to Belfast found on momondo in the last 72 hours is £599
The fastest flight from Seattle to Belfast takes 14h 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. 14h 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.

Frequently asked questions about flying from Seattle to Belfast

  • How do I get Price Alerts for flights from Seattle to Belfast?

    You can take advantage of momondo’s Price Alerts by first searching for your flights to Seattle from Belfast. Flight offers will be shown to you in real-time. From there you can create a Price Alert by using our on-site widget.

  • How can I save money on flights from Seattle to Belfast with momondo?

    With “Price Forecast”, learn how soon you should book your flight in advance. Down to the day of week and time of day, our information can inform you on the ideal time to book to save on your travel. Our “Price Calendar” shows you at a quick glance when to book your travel for lower rates. By setting “Price Alerts” you can monitor changes in price and target the ideal time to book. Search for your trip destination by budget amount via our “Explore” feature. Whether you’re looking for ideas for your next travel adventure or cost-cutting tips, our “Discover” content is a great place to start.

  • How does momondo find its flight prices?

    We aggregate our prices from over 700+ competitors from airlines to OTAs. We operate in over 30 markets worldwide to show you a wide range of travel options.

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

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Find better results for your trip to the United Kingdom

Fly into one of these airports located in Belfast

Belfast Intl Airport
Belfast City Airport