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Cheap flights from Seattle to Northern Ireland from £299

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 21/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BFS
30 Jul — 6 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 30 June 2026.

Mon 5/1020:20
SEA
-
BHD
1 stop16h 15m
British Airways
Thu 22/1020:35
BHD
-
SEA
1 stop23h 00m
British Airways
Deal found 25/6£669
Sun 4/1020:20
SEA
-
BHD
1 stop14h 25m
British Airways
Sun 18/1020:10
BHD
-
SEA
1 stop23h 25m
British Airways
Deal found 28/6£682
Tue 18/819:00
SEA
-
BFS
3 stops20h 20m
Multiple Airlines
Tue 25/807:00
BFS
-
SEA
3 stops34h 40m
Multiple Airlines
Deal found 29/6£684
Mon 5/1015:10
SEA
-
BHD
2 stops16h 20m
American Airlines
Thu 22/1006:30
BHD
-
SEA
1 stop13h 05m
American Airlines
Deal found 25/6£685
Sun 4/1021:45
SEA
-
BFS
1 stop30h 30m
Multiple Airlines
Sun 18/1019:35
BFS
-
SEA
2 stops29h 35m
Multiple Airlines
Deal found 28/6£686
Wed 11/1108:11
SEA
-
BHD
2 stops18h 04m
British Airways
Sun 15/1112:10
BHD
-
SEA
1 stop12h 45m
British Airways
Deal found 28/6£686
Fri 11/915:40
SEA
-
BFS
3 stops21h 05m
Multiple Airlines
Wed 16/920:15
BFS
-
SEA
3 stops32h 25m
Multiple Airlines
Deal found 28/6£746
Fri 11/920:20
SEA
-
BHD
1 stop13h 50m
British Airways
Wed 16/906:30
BHD
-
SEA
1 stop13h 05m
British Airways
Deal found 28/6£747
Fri 14/820:20
SEA
-
BHD
1 stop16h 15m
British Airways
Fri 21/806:30
BHD
-
SEA
1 stop13h 05m
British Airways
Deal found 30/6£748
Mon 10/815:40
SEA
-
BFS
3 stops23h 40m
Multiple Airlines
Mon 17/806:30
BFS
-
SEA
3 stops35h 10m
Multiple Airlines
Deal found 26/6£801

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 30 June 2026.

Round-trip from

£669

One-way from

£299
British Airways
  • British Airways
  • 5/10-22/10
  • 2 total stops
  • 39h 15m total
  • Seattle to Northern Ireland
Search Deals
21/9
  • 21/9
  • 2 total stops
  • 37h 15m 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 30 June 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 - BHD

SEABHD

Seattle/Tacoma Intl

Mon 5/10

13:30-12:55

1 stop15h 25m

Belfast City

Thu 22/10

12:45-18:25

1 stop13h 40m

£669

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 18/8

19:00-23:20

3 stops20h 20m

Belfast Intl

Tue 25/8

07:00-09:40

3 stops34h 40m

£684

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 5/10

15:10-15:30

2 stops16h 20m

Belfast City

Thu 22/10

06:30-11:35

1 stop13h 05m

£685

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 5/10

15:10-15:30

2 stops16h 20m

Belfast City

Thu 22/10

06:30-19:30

2 stops21h 00m

£694

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 4/10

21:45-12:15

1 stop30h 30m

Belfast Intl

Sun 18/10

19:35-18:55

1 stop31h 20m

£724

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Wed 11/11

14:35-20:45

3 stops22h 10m

Belfast Intl

Sun 15/11

07:00-17:00

3 stops42h 00m

£751

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 10/8

15:40-23:20

3 stops23h 40m

Belfast Intl

Mon 17/8

06:30-09:40

3 stops35h 10m

£801

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Fri 14/8

13:24-18:10

2 stops20h 46m

Belfast City

Fri 21/8

06:30-18:47

2 stops20h 17m

£855

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 25/7

07:20-09:20

2 stops18h 00m

Belfast City

Sat 1/8

09:50-16:27

1 stop14h 37m

£1,028

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 15/7

14:30-16:55

2 stops18h 25m

Belfast City

Sat 18/7

09:50-16:20

1 stop14h 30m

£6,362

Flights are sorted by cheapest return flights first.

Deals found on 25/6

Showing 1-10 of 14 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 16h 10m. Your travel time can differ by up to 05m. 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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