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Cheap flights from Seattle to Northern Ireland from £184

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BFS
13 Mar — 20 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Seattle to Northern Ireland

Enter your travel dates to find the best prices.

Cheapest flights from Seattle to Northern Ireland
Explore the most affordable flight options available from Seattle to Northern Ireland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 11 February 2026.

Sat 7/318:50
SEA
-
BHD
1 stop16h 50m
British Airways
Tue 17/306:35
BHD
-
SEA
1 stop18h 20m
British Airways
Deal found 8/2£458
Sat 7/318:50
SEA
-
BHD
1 stop16h 50m
British Airways
Wed 18/309:15
BHD
-
SEA
2 stops20h 49m
British Airways
Deal found 8/2£499
Sat 28/305:30
SEA
-
BHD
2 stops28h 45m
British Airways
Mon 6/406:30
BHD
-
SEA
1 stop13h 05m
British Airways
Deal found 8/2£561
Sat 28/317:30
SEA
-
BHD
1 stop15h 25m
Multiple Airlines
Mon 6/409:50
BHD
-
SEA
1 stop33h 55m
Multiple Airlines
Deal found 8/2£562
Tue 26/520:20
SEA
-
BHD
1 stop15h 20m
British Airways
Wed 3/606:30
BHD
-
SEA
1 stop13h 05m
British Airways
Deal found 10/2£588
Mon 9/315:35
SEA
-
BFS
2 stops21h 40m
Multiple Airlines
Sun 15/305:45
BFS
-
SEA
3 stops41h 55m
Multiple Airlines
Deal found 10/2£591
Thu 26/315:35
SEA
-
BFS
2 stops21h 50m
Multiple Airlines
Thu 2/410:20
BFS
-
SEA
2 stops18h 20m
Multiple Airlines
Deal found 9/2£621
Fri 3/405:30
SEA
-
BHD
2 stops26h 00m
British Airways
Sun 12/419:10
BHD
-
SEA
1 stop24h 25m
British Airways
Deal found 7/2£626
Thu 21/515:40
SEA
-
BFS
2 stops19h 50m
Multiple Airlines
Tue 26/508:20
BFS
-
SEA
2 stops20h 20m
Multiple Airlines
Deal found 9/2£758
Tue 26/518:50
SEA
-
BFS
2 stops20h 10m
Multiple Airlines
Wed 3/606:00
BFS
-
SEA
3 stops22h 40m
Multiple Airlines
Deal found 10/2£797
Fri 3/408:00
SEA
-
BFS
3 stops29h 15m
Multiple Airlines
Sun 12/421:05
BFS
-
SEA
3 stops30h 13m
Multiple Airlines
Deal found 7/2£800
Sat 28/319:00
SEA
-
BFS
2 stops17h 50m
Multiple Airlines
Mon 6/406:40
BFS
-
SEA
2 stops19h 15m
Multiple Airlines
Deal found 8/2£816

Find flight deals from Seattle to Northern Ireland

Keep the following information in mind while searching for Seattle to Northern Ireland flight deals. Data was last updated 11 February 2026.

Round-trip from

£458

One-way from

£184
British Airways
  • British Airways
  • 7/3-18/3
  • 2 total stops
  • 32h 30m total
  • Seattle to Northern Ireland
Search Deals
Delta
  • Delta
  • 11/5
  • 2 total stops
  • 20h 10m total
  • Seattle to Northern Ireland
Search Deals

Cheapflights 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, Cheapflights users made 858,174 searches. Data last updated 11 February 2026.
Use the filters below to find and compare flights from Seattle to Northern Ireland that are best for you.

Fly from

Seattle

Fly to

Northern Ireland

Route

Depart

Return

Price

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 7/3

18:50-19:40

1 stop16h 50m

Belfast City

Tue 17/3

06:35-17:55

1 stop18h 20m

£458

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 7/3

18:50-19:40

1 stop16h 50m

Belfast City

Wed 18/3

09:15-17:55

1 stop15h 40m

£458

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 28/3

05:30-17:15

2 stops28h 45m

Belfast City

Mon 6/4

06:30-11:35

1 stop13h 05m

£561

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 28/3

17:30-15:55

1 stop15h 25m

Belfast City

Mon 6/4

09:50-11:45

1 stop33h 55m

£562

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 26/5

20:20-19:40

1 stop15h 20m

Belfast City

Wed 3/6

06:30-11:35

1 stop13h 05m

£588

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 9/3

15:35-20:15

2 stops21h 40m

Belfast Intl

Sun 15/3

05:45-16:40

3 stops41h 55m

£591

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 26/3

15:35-20:25

2 stops21h 50m

Belfast Intl

Thu 2/4

10:20-20:40

2 stops18h 20m

£621

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Fri 3/4

05:30-15:30

2 stops26h 00m

Belfast City

Sun 12/4

19:10-11:35

1 stop24h 25m

£626

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 21/5

15:40-19:30

2 stops19h 50m

Belfast Intl

Tue 26/5

08:20-20:40

2 stops20h 20m

£758

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Fri 3/4

08:00-21:15

3 stops29h 15m

Belfast Intl

Sun 12/4

21:05-19:18

3 stops30h 13m

£800

Flights are sorted by cheapest return flights first.

Deals found on 8/2

Showing 1-10 of 24 results
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Best time to book a flight from Seattle to Northern Ireland

Have a flexible travel schedule? Discover the best time to fly to Northern Ireland from Seattle with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Northern Ireland
No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Northern Ireland. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Seattle to Northern Ireland?

    Located just 11.4 mi from the city center, Seattle/Tacoma Intl (SEA) is the airport most travelers will use when flying to Northern Ireland from Seattle.

  • How long is the flight from Seattle to Northern Ireland?

    British Airways can get you from Seattle to Northern Ireland in just under 16h 50m. Your travel time can differ by up to . There are 4472 mi between Seattle and Northern Ireland.

  • Can I find deals for flights from Seattle to Northern Ireland that include hotel bookings?

    Yes. In addition to deals on Seattle to Northern Ireland flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Northern Ireland?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Northern Ireland.

  • Can I find deals for business class flights from Seattle to Northern Ireland?

    Yes. Cheapflights offers flight deals from Seattle to Northern Ireland by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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How does Cheapflights help users find flights from Seattle to Northern Ireland?

Deals for Seattle to Northern Ireland flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Northern Ireland?

Cheapflights simply makes it quick and affordable to book flights from Seattle to Northern Ireland by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Seattle to Northern Ireland with no change fees?

Yes! Cheapflights helps users easily find flights from Seattle to Northern Ireland with no change fees.

Can Cheapflights notify me if prices for flights from Seattle to Northern Ireland become cheaper?

Not ready to book yet? You can track prices for flights from Seattle to Northern Ireland on Cheapflights with our Price Alert feature and get notified when better prices are available.

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