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Cheap flights from Northern Ireland to Seattle from £389

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 25/8. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — SEA
3 Jun — 10 Jun1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Northern Ireland to Seattle

Enter your travel dates to find the best prices.

Cheapest flights from Northern Ireland to Seattle
Explore the most affordable flight options available from Northern Ireland to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 4 May 2026.

Tue 1/913:45
BHD
-
SEA
1 stop12h 40m
British Airways
Tue 22/920:20
SEA
-
BHD
1 stop13h 15m
British Airways
Deal found 30/4£710
Tue 1/907:15
BFS
-
SEA
2 stops18h 40m
Multiple Airlines
Tue 22/919:00
SEA
-
BFS
2 stops13h 20m
Multiple Airlines
Deal found 30/4£725
Tue 1/909:40
BHD
-
SEA
2 stops22h 10m
Multiple Airlines
Tue 22/913:24
SEA
-
BHD
2 stops17h 56m
Multiple Airlines
Deal found 1/5£730
Thu 5/1115:05
BHD
-
SEA
1 stop33h 50m
British Airways
Sun 8/1114:46
SEA
-
BHD
2 stops35h 54m
British Airways
Deal found 29/4£745
Thu 10/916:35
BHD
-
SEA
1 stop27h 00m
British Airways
Mon 14/906:24
SEA
-
BHD
2 stops22h 31m
British Airways
Deal found 30/4£772

Find flight deals from Northern Ireland to Seattle

Keep the following information in mind while searching for Northern Ireland to Seattle flight deals. Data was last updated 4 May 2026.

Round-trip from

£710

One-way from

£389
British Airways
  • British Airways
  • 1/9-22/9
  • 2 total stops
  • 25h 55m total
  • Northern Ireland to Seattle
Search Deals
25/8
  • 25/8
  • 3 total stops
  • 32h 30m total
  • Northern Ireland to Seattle
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Northern Ireland to Seattle 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 4 May 2026.
Use the filters below to find and compare flights from Northern Ireland to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight
Fastest return journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 1/9

13:45-18:25

1 stop12h 40m

Seattle/Tacoma Intl

Tue 22/9

20:20-17:35

1 stop13h 15m

£710

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 1/9

07:15-17:55

2 stops18h 40m

Seattle/Tacoma Intl

Tue 22/9

19:00-16:20

2 stops13h 20m

£725

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 1/9

09:40-23:50

2 stops22h 10m

Seattle/Tacoma Intl

Tue 22/9

13:24-15:20

2 stops17h 56m

£730

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 10/9

20:35-19:24

2 stops30h 49m

Seattle/Tacoma Intl

Mon 14/9

06:24-12:55

2 stops22h 31m

£777

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 3/9

20:35-11:35

1 stop23h 00m

Seattle/Tacoma Intl

Mon 7/9

15:47-18:45

2 stops18h 58m

£805
Cheapest one-way

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 25/8

16:40-17:10

3 stops32h 30m

£389

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sat 18/7

21:40-18:45

3 stops53h 05m

£415

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sun 2/8

19:20-18:45

3 stops55h 25m

£470

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 16/7

06:40-21:00

3 stops22h 20m

£471

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 25/8

14:20-20:40

2 stops38h 20m

£511

Flights are sorted by cheapest return flights first.

Deals found on 2/5

Showing 1-10 of 15 resultsSorted by cheapest first
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Best time to book a flight from Northern Ireland to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Northern Ireland 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 Northern Ireland to Seattle
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 Northern Ireland to Seattle. 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 into for flights to Seattle from Northern Ireland?

    Most people fly into Seattle/Tacoma Intl (SEA) if they book a flight to Seattle from Northern Ireland. Seattle/Tacoma Intl is conveniently located just 11.4 mi from Seattle’s city center.

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

    For as low as £710, British Airways can have you in Seattle from Northern Ireland in 12h 40m. Airlines will cover a distance of 4472 mi.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Northern Ireland to Seattle 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

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
Federal Way
SeaTac

Browse thousands of different options on Cheapflights for your next trip

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Top airline flying from Northern Ireland to Seattle

Discover the top airline that operate flights from Northern Ireland to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 4 May 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£553Average£553FlexibilityNo cancel feeOn-time71%
Search American Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Northern Ireland to Seattle. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

Cheapflights helps you find that perfect flight to Seattle from Northern Ireland by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

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

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

Yes! Start tracking prices for Northern Ireland to Seattle flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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