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.

£198 Cheap Flights from Seattle to Northern Ireland in 2026

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Find the cheapest flights from Seattle to Northern Ireland

Round-trip

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

19:00 - 21:30

SEA

BFS

18h 30m

3 stops

20:15 - 09:40

BFS

SEA

45h 25m

3 stops

£580Multiple Airlines

Thu, 7 May - Sat, 16 May

19:00 - 18:55

SEA

BFS

15h 55m

2 stops

20:15 - 09:40

BFS

SEA

45h 25m

3 stops

£627Multiple Airlines

Thu, 7 May - Sat, 16 May

20:20 - 18:55

SEA

BHD

14h 35m

1 stop

09:40 - 18:25

BHD

SEA

16h 45m

1 stop

£629British Airways

Tue, 1 Sep - Tue, 22 Sep

20:20 - 20:35

SEA

BHD

16h 15m

1 stop

19:40 - 11:35

BHD

SEA

23h 55m

1 stop

£630British Airways

Wed, 2 Sep - Wed, 9 Sep

20:20 - 17:30

SEA

BHD

13h 10m

1 stop

19:35 - 11:35

BHD

SEA

24h 00m

1 stop

£651British Airways

Mon, 14 Sep - Mon, 21 Sep

15:40 - 21:40

SEA

BFS

22h 00m

3 stops

22:00 - 09:40

BFS

SEA

43h 40m

3 stops

£653Multiple Airlines

Thu, 16 Apr - Sun, 3 May

06:24 - 12:55

SEA

BHD

22h 31m

2 stops

19:35 - 11:35

BHD

SEA

24h 00m

1 stop

£656British Airways

Mon, 14 Sep - Mon, 21 Sep

20:20 - 20:35

SEA

BHD

16h 15m

1 stop

19:40 - 18:49

BHD

SEA

31h 09m

2 stops

£661British Airways

Wed, 2 Sep - Wed, 9 Sep

20:20 - 20:35

SEA

BHD

16h 15m

1 stop

06:30 - 11:35

BHD

SEA

13h 05m

1 stop

£664British Airways

Wed, 2 Sep - Sun, 6 Sep

13:32 - 13:35

SEA

BHD

16h 03m

2 stops

06:30 - 17:29

BHD

SEA

18h 59m

2 stops

£707American Airlines

Wed, 2 Sep - Wed, 9 Sep

American Airlines flights from Seattle to Northern Ireland

Our best American Airlines deals on Seattle to Northern Ireland flight tickets

American Airlines

2 Sept

SEA13:32Seattle/Tacoma Intl

16h 03m

2 stops

BHD13:35Belfast City

9 Sept

BHD06:30Belfast City

18h 59m

2 stops

SEA17:29Seattle/Tacoma Intl

£707

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

American Airlines

2 Apr

SEA00:13Seattle/Tacoma Intl

33h 57m

2 stops

BHD18:10Belfast City

11 Apr

BHD07:05Belfast City

22h 18m

2 stops

SEA21:23Seattle/Tacoma Intl

£987

British Airways flights from Seattle to Northern Ireland

Our best British Airways deals on Seattle to Northern Ireland 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

9 Sept

BHD19:40Belfast City

23h 55m

1 stop

SEA11:35Seattle/Tacoma Intl

£630

British Airways

14 Sept

SEA20:20Seattle/Tacoma Intl

13h 10m

1 stop

BHD17:30Belfast City

21 Sept

BHD19:35Belfast City

24h 00m

1 stop

SEA11:35Seattle/Tacoma Intl

£651

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

Sat 16/5

20:15-09:40

3 stops45h 25m

£580

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 7/5

19:00-18:55

2 stops15h 55m

Belfast Intl

Sat 16/5

20:15-09:40

3 stops45h 25m

£627

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 - BHD

SEABHD

Seattle/Tacoma Intl

Wed 2/9

20:20-20:35

1 stop16h 15m

Belfast City

Wed 9/9

19:40-11:35

1 stop23h 55m

£630

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 14/9

20:20-17:30

1 stop13h 10m

Belfast City

Mon 21/9

19:35-11:35

1 stop24h 00m

£651

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 - BHD

SEABHD

Seattle/Tacoma Intl

Mon 14/9

06:24-12:55

2 stops22h 31m

Belfast City

Mon 21/9

19:35-11:35

1 stop24h 00m

£656

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 2/9

20:20-20:35

1 stop16h 15m

Belfast City

Wed 9/9

19:40-18:49

2 stops31h 09m

£661

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

£664

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 2/9

13:32-13:35

2 stops16h 03m

Belfast City

Wed 9/9

06:30-17:29

2 stops18h 59m

£707

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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 and Aer Lingus are the most popular carriers 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

Fastest flight time	13h 10m
Direct flights	None

The fastest flight from Seattle to Northern Ireland takes 13h 10m

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.