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Cheap flights from Seattle to Northern Ireland from £289

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 3/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BFS
17 Aug — 24 Aug1
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 18 July 2026.

Wed 11/1118:45
SEA
-
BHD
1 stop13h 50m
British Airways
Mon 16/1119:25
BHD
-
SEA
1 stop24h 00m
British Airways
Deal found 14/7£660
Sat 29/815:40
SEA
-
BFS
3 stops20h 40m
Multiple Airlines
Sat 5/921:40
BFS
-
SEA
3 stops29h 05m
Multiple Airlines
Deal found 15/7£664
Sun 23/815:40
SEA
-
BFS
2 stops20h 35m
Multiple Airlines
Sun 30/809:55
BFS
-
SEA
2 stops33h 50m
Multiple Airlines
Deal found 13/7£679
Wed 11/1114:35
SEA
-
BFS
3 stops22h 10m
Multiple Airlines
Mon 16/1106:30
BFS
-
SEA
2 stops18h 30m
Multiple Airlines
Deal found 14/7£684
Mon 5/1020:20
SEA
-
BHD
1 stop15h 05m
British Airways
Thu 22/1012:45
BHD
-
SEA
1 stop13h 40m
British Airways
Deal found 13/7£702
Tue 18/820:20
SEA
-
BHD
1 stop15h 20m
British Airways
Mon 31/809:40
BHD
-
SEA
1 stop33h 55m
British Airways
Deal found 15/7£719
Mon 10/813:30
SEA
-
BHD
1 stop21h 15m
British Airways
Mon 17/819:35
BHD
-
SEA
1 stop24h 00m
British Airways
Deal found 13/7£739

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 18 July 2026.

Round-trip from

£644

One-way from

£289
26/8-29/8
  • 26/8-29/8
  • 6 total stops
  • 68h 00m total
  • Seattle to Northern Ireland
Search Deals
3/9
  • 3/9
  • 2 total stops
  • 48h 40m 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 18 July 2026.
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

Cheapest return flight

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 - 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

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 23/8

15:40-20:15

2 stops20h 35m

Belfast Intl

Sun 30/8

09:55-11:45

2 stops33h 50m

£679

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 5/10

10:31-12:55

2 stops18h 24m

Belfast City

Thu 22/10

20:35-11:35

1 stop23h 00m

£722

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 10/8

11:48-18:45

2 stops22h 57m

Belfast City

Mon 17/8

19:35-11:35

1 stop24h 00m

£762

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Wed 11/11

14:35-19:45

2 stops21h 10m

Belfast Intl

Mon 16/11

06:30-17:00

2 stops18h 30m

£777

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Fri 7/8

13:30-20:35

1 stop23h 05m

Belfast City

Wed 9/9

06:30-11:35

1 stop13h 05m

£809

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 10/8

19:00-23:05

3 stops20h 05m

Belfast Intl

Mon 17/8

21:50-10:05

3 stops44h 15m

£829
Fastest return journey

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 10/1

06:12-10:20

2 stops20h 08m

Belfast City

Thu 14/1

11:05-16:50

1 stop13h 45m

£847

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 13/8

19:10-22:50

2 stops19h 40m

Belfast Intl

Wed 19/8

07:35-18:45

3 stops43h 10m

£867

Flights are sorted by cheapest return flights first.

Deals found on 13/7

Showing 1-10 of 16 resultsSorted by cheapest first
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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 18h 04m. 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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