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Cheap flights from Seattle to Northern Ireland from £228

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 Northern Ireland departing on 7/10. 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
0 bags
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Cheap return flights

Logo
19:35 - 18:35SEA-BFS
15h 00m2 stops
Logo
05:45 - 17:50BFS-SEA
20h 05m2 stops
£539
Find Deal
Wed, 10 Sep - Wed, 17 Sep
British Airways Logo
19:50 - 16:35SEA-BHD
13h 45m1 stop
British Airways Logo
09:15 - 16:55BHD-SEA
15h 40m1 stop
£558British Airways
Find Deal
Wed, 29 Oct - Wed, 5 Nov
British Airways Logo
19:50 - 16:35SEA-BHD
13h 45m1 stop
British Airways Logo
19:25 - 16:55BHD-SEA
29h 30m1 stop
£559British Airways
Find Deal
Wed, 29 Oct - Wed, 5 Nov
British Airways Logo
18:50 - 16:35SEA-BHD
13h 45m1 stop
British Airways Logo
06:30 - 16:55BHD-SEA
18h 25m1 stop
£580British Airways
Find Deal
Wed, 3 Dec - Sun, 7 Dec
British Airways Logo
18:50 - 07:30SEA-BHD
28h 40m1 stop
British Airways Logo
10:40 - 16:55BHD-SEA
14h 15m1 stop
£588British Airways
Find Deal
Wed, 3 Dec - Sun, 7 Dec
KLM Logo
17:40 - 21:15SEA-BHD
19h 35m1 stop
KLM Logo
06:30 - 11:45BHD-SEA
13h 15m1 stop
£607KLM
Find Deal
Wed, 10 Sep - Wed, 17 Sep
British Airways Logo
18:50 - 16:35SEA-BHD
13h 45m1 stop
British Airways Logo
10:40 - 16:55BHD-SEA
14h 15m1 stop
£609British Airways
Find Deal
Wed, 3 Dec - Sun, 7 Dec
KLM Logo
14:10 - 21:15SEA-BHD
23h 05m1 stop
KLM Logo
06:30 - 16:06BHD-SEA
17h 36m2 stops
£615KLM
Find Deal
Wed, 10 Sep - Wed, 17 Sep
Delta Logo
07:20 - 21:00SEA-BHD
29h 40m2 stops
Delta Logo
06:30 - 11:50BHD-SEA
13h 20m1 stop
£647Delta
Find Deal
Wed, 3 Dec - Sun, 7 Dec
Delta Logo
07:20 - 21:00SEA-BHD
29h 40m2 stops
Delta Logo
06:30 - 11:50BHD-SEA
13h 20m1 stop
£648Delta
Find Deal
Wed, 3 Dec - Sun, 7 Dec

British Airways flights from Seattle to Northern Ireland

Our best British Airways deals on Seattle to Northern Ireland flight tickets
British Airways
29 Oct
SEA19:50Seattle/Tacoma Intl
13h 45m
1 stop
BHD16:35Belfast City
5 Nov
BHD09:15Belfast City
15h 40m
1 stop
SEA16:55Seattle/Tacoma Intl
£558
Find similar
British Airways
29 Oct
SEA19:50Seattle/Tacoma Intl
13h 45m
1 stop
BHD16:35Belfast City
5 Nov
BHD19:25Belfast City
29h 30m
1 stop
SEA16:55Seattle/Tacoma Intl
£559
Find similar
British Airways
3 Dec
SEA18:50Seattle/Tacoma Intl
13h 45m
1 stop
BHD16:35Belfast City
7 Dec
BHD06:30Belfast City
18h 25m
1 stop
SEA16:55Seattle/Tacoma Intl
£580
Find similar

Delta flights from Seattle to Northern Ireland

Our best Delta deals on Seattle to Northern Ireland flight tickets
Delta
3 Dec
SEA07:20Seattle/Tacoma Intl
29h 40m
2 stops
BHD21:00Belfast City
7 Dec
BHD06:30Belfast City
13h 20m
1 stop
SEA11:50Seattle/Tacoma Intl
£647
Find similar
Delta
3 Dec
SEA07:20Seattle/Tacoma Intl
29h 40m
2 stops
BHD21:00Belfast City
7 Dec
BHD06:30Belfast City
13h 20m
1 stop
SEA11:50Seattle/Tacoma Intl
£648
Find similar
Delta
3 Dec
SEA11:15Seattle/Tacoma Intl
21h 35m
2 stops
BHD16:50Belfast City
7 Dec
BHD06:30Belfast City
23h 46m
2 stops
SEA22:16Seattle/Tacoma Intl
£655
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from Seattle to Northern Ireland 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 22 August 2025.
Use the filters below to find and compare flights from Seattle to Northern Ireland that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Wed 10/9

19:35-18:35

2 stops15h 00m

Belfast Intl

Wed 17/9

05:45-17:50

2 stops20h 05m

£539

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 29/10

19:50-16:35

1 stop13h 45m

Belfast City

Wed 5/11

09:15-16:55

1 stop15h 40m

£558

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 29/10

19:50-16:35

1 stop13h 45m

Belfast City

Wed 5/11

19:25-16:55

1 stop29h 30m

£559

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 3/12

18:50-16:35

1 stop13h 45m

Belfast City

Sun 7/12

06:30-16:55

1 stop18h 25m

£580

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 3/12

18:50-07:30

1 stop28h 40m

Belfast City

Sun 7/12

10:40-16:55

1 stop14h 15m

£588

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 10/9

17:40-21:15

1 stop19h 35m

Belfast City

Wed 17/9

06:30-11:45

1 stop13h 15m

£607

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 3/12

18:50-16:35

1 stop13h 45m

Belfast City

Sun 7/12

10:40-16:55

1 stop14h 15m

£609

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 10/9

14:10-21:15

1 stop23h 05m

Belfast City

Wed 17/9

06:30-16:06

2 stops17h 36m

£614

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 3/12

07:20-21:00

2 stops29h 40m

Belfast City

Sun 7/12

06:30-11:50

1 stop13h 20m

£647

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 3/12

07:20-21:00

2 stops29h 40m

Belfast City

Sun 7/12

06:30-11:50

1 stop13h 20m

£648

Flights are sorted by cheapest return flights first.

Showing 1-10 of 15 resultsSorted by cheapest first
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See travel insights to Northern Ireland from

How to get the cheapest flight ticket from Seattle to Northern Ireland

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 Northern Ireland?

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

Cheap Seattle to Northern Ireland flight deals and tips

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

Direct flights

None
There are no direct flights from Seattle to Northern Ireland. There are no popular flight routes from Seattle to Northern Ireland.
Search flight deals

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

    Prices for flights from Seattle/Tacoma Intl Airport to Northern Ireland were last updated today.

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Northern Ireland?

    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 Northern Ireland.

  • What documentation or ID do you need to fly to Northern Ireland?

    The travel and health documents required for your trip to Northern Ireland can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Northern Ireland. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Why use momondo?

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

It is quick and easy to find Seattle to Northern Ireland flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Northern Ireland that suits you.

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

Yes. All flights to Northern Ireland from Seattle on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Seattle to Northern Ireland?

Once all potential Seattle to Northern Ireland flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Yes. momondo can track prices for Seattle to Northern Ireland flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your Northern Ireland 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 Northern Ireland

Popular Cities in Northern Ireland

Popular flights according to clicks in the last 7 days on momondo
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