Find flights
When to book
FAQs

Cheap flights from Northern Ireland to Seattle from £348

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 1/10. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — SEA
18 May — 25 May1
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 18 April 2026.

Wed 22/408:55
BFS
-
SEA
2 stops19h 45m
Multiple Airlines
Thu 7/515:40
SEA
-
BFS
2 stops23h 50m
Multiple Airlines
Deal found 16/4£629
Mon 14/908:45
BHD
-
SEA
2 stops19h 55m
Multiple Airlines
Sun 20/919:00
SEA
-
BHD
2 stops17h 30m
Multiple Airlines
Deal found 13/4£700
Mon 14/908:15
BFS
-
SEA
2 stops20h 25m
Multiple Airlines
Sun 20/915:40
SEA
-
BFS
2 stops20h 35m
Multiple Airlines
Deal found 13/4£702
Wed 16/906:10
BFS
-
SEA
2 stops22h 30m
Multiple Airlines
Wed 30/915:40
SEA
-
BFS
2 stops21h 30m
Multiple Airlines
Deal found 17/4£712
Wed 16/907:00
BHD
-
SEA
2 stops21h 40m
Multiple Airlines
Wed 30/908:00
SEA
-
BHD
3 stops23h 30m
Multiple Airlines
Deal found 17/4£727
Mon 14/919:35
BHD
-
SEA
2 stops29h 54m
British Airways
Sun 20/920:20
SEA
-
BHD
1 stop14h 25m
British Airways
Deal found 13/4£730
Wed 16/906:30
BHD
-
SEA
1 stop13h 05m
British Airways
Wed 30/913:30
SEA
-
BHD
1 stop14h 30m
British Airways
Deal found 17/4£740
Thu 12/1117:45
BHD
-
SEA
1 stop31h 10m
British Airways
Mon 16/1111:42
SEA
-
BHD
2 stops18h 33m
British Airways
Deal found 13/4£741
Wed 13/511:35
BHD
-
SEA
2 stops21h 01m
British Airways
Wed 20/513:30
SEA
-
BHD
1 stop14h 30m
British Airways
Deal found 13/4£754

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 18 April 2026.

Round-trip from

£700

One-way from

£348
14/9-20/9
  • 14/9-20/9
  • 4 total stops
  • 37h 25m total
  • Northern Ireland to Seattle
Search Deals
1/10
  • 1/10
  • 3 total stops
  • 35h 22m 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 18 April 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

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 14/9

08:45-20:40

2 stops19h 55m

Seattle/Tacoma Intl

Sun 20/9

19:00-20:30

2 stops17h 30m

£700

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 14/9

08:15-20:40

2 stops20h 25m

Seattle/Tacoma Intl

Sun 20/9

15:40-20:15

2 stops20h 35m

£702

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 16/9

08:15-20:40

2 stops20h 25m

Seattle/Tacoma Intl

Wed 30/9

08:00-22:20

3 stops30h 20m

£715

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 16/9

07:00-20:40

2 stops21h 40m

Seattle/Tacoma Intl

Wed 30/9

15:40-21:05

2 stops21h 25m

£728

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 14/9

19:35-11:35

1 stop24h 00m

Seattle/Tacoma Intl

Sun 20/9

20:20-18:45

1 stop14h 25m

£731

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 16/9

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Wed 30/9

15:12-15:40

2 stops16h 28m

£743

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 13/5

11:35-00:36

2 stops21h 01m

Seattle/Tacoma Intl

Wed 20/5

13:30-12:00

1 stop14h 30m

£754
Fastest return journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 14/10

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Sun 18/10

13:30-10:30

1 stop13h 00m

£764

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 3/9

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Mon 7/9

15:47-18:45

2 stops18h 58m

£780
Cheapest one-way

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 1/10

07:00-10:22

3 stops35h 22m

£348

Flights are sorted by cheapest return flights first.

Deals found on 13/4

Showing 1-10 of 15 resultsSorted by cheapest first
1
2

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 £743, British Airways can have you in Seattle from Northern Ireland in 13h 05m. 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 18 April 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£555Average£555FlexibilityNo 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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.