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Cheap flights from Seattle to Northern Ireland from £260

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 1/11. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BFS
13 Sep — 20 Sep1
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 14 August 2026.

Sun 15/1118:45 -
1 stop15h 55m
Wed 18/1109:15 -
1 stop15h 35m
Deal found 10/8£671
Sun 27/915:40 -
2 stops21h 20m
Sun 4/1009:55 -
2 stops18h 45m
Deal found 13/8£676
Mon 28/918:55 -
2 stops16h 25m
Mon 5/1006:10 -
2 stops19h 00m
Deal found 14/8£687
Mon 5/1020:20 -
1 stop15h 05m
Thu 22/1012:45 -
1 stop13h 40m
Deal found 10/8£699
Mon 5/1015:14 -
2 stops16h 16m
Thu 22/1014:20 -
1 stop29h 15m
Deal found 11/8£718
Thu 24/919:00 -
2 stops16h 20m
Thu 1/1006:10 -
2 stops22h 30m
Deal found 10/8£749
Sun 6/913:30 -
1 stop13h 00m
Sun 13/920:10 -
2 stops36h 01m
Deal found 10/8£818
Sun 23/819:00 -
2 stops18h 20m
Sat 29/820:15 -
3 stops45h 25m
Deal found 13/8£882

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 14 August 2026.

Round-trip from

£671

One-way from

£260
British Airways
  • British Airways
  • 15/11-18/11
  • 2 total stops
  • 31h 30m total
  • Seattle to Northern Ireland
Search Deals
1/11
  • 1/11
  • 2 total stops
  • 23h 05m 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 14 August 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
Fastest return journey

SeattleBelfast

SEA Seattle/Tacoma Intl - BHD Belfast City

SEABHD

Seattle/Tacoma Intl

Sun 15/11

18:45-18:40

1 stop15h 55m

Belfast City

Wed 18/11

09:15-16:50

1 stop15h 35m

£671

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Sun 27/9

15:40-21:00

2 stops21h 20m

Belfast Intl

Sun 4/10

09:55-20:40

2 stops18h 45m

£676

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Mon 28/9

18:55-19:20

2 stops16h 25m

Belfast Intl

Mon 5/10

06:10-17:10

2 stops19h 00m

£687

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

£718

SeattleBelfast

SEA Seattle/Tacoma Intl - BHD Belfast City

SEABHD

Seattle/Tacoma Intl

Mon 5/10

10:31-12:55

2 stops18h 24m

Belfast City

Thu 22/10

12:45-00:36

2 stops19h 51m

£734

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Thu 24/9

19:00-19:20

2 stops16h 20m

Belfast Intl

Thu 1/10

06:10-20:40

2 stops22h 30m

£749

SeattleBelfast

SEA Seattle/Tacoma Intl - BHD Belfast City

SEABHD

Seattle/Tacoma Intl

Sun 6/9

10:19-14:35

2 stops20h 16m

Belfast City

Sun 13/9

20:10-21:36

2 stops33h 26m

£819

SeattleBelfast

SEA Seattle/Tacoma Intl - BHD Belfast City

SEABHD

Seattle/Tacoma Intl

Tue 29/9

20:20-20:35

1 stop16h 15m

Belfast City

Tue 20/10

20:25-11:35

1 stop23h 10m

£3,942
Cheapest one-way

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Sun 1/11

14:35-21:40

2 stops23h 05m

£260

SeattleBelfast

SEA Seattle/Tacoma Intl - BFS Belfast Intl

SEABFS

Seattle/Tacoma Intl

Wed 11/11

19:41-19:50

3 stops40h 09m

£274

Flights are sorted by cheapest return flights first.

Deals found on 14/8

Showing 1-10 of 13 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 and American Airlines can get you from Seattle to Northern Ireland in just under 15h 55m. Your travel time can differ by up to 21m. There are 4472 mi between Seattle and Northern Ireland. This flight may include one or multiple stops.

  • 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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