Find flights
When to book
FAQs

Cheap flights from Northern Ireland to Seattle from £496

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 3/1. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — SEA
31 Aug — 7 Sep1
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 1 August 2026.

Thu 3/906:10
BFS
-
SEA
2 stops22h 30m
Multiple Airlines
Tue 8/919:00
SEA
-
BFS
2 stops18h 05m
Multiple Airlines
Deal found 29/7£641
Mon 5/1010:35
BFS
-
SEA
1 stop17h 39m
Multiple Airlines
Fri 9/1007:15
SEA
-
BFS
2 stops22h 35m
Multiple Airlines
Deal found 31/7£669
Mon 5/1008:45
BHD
-
SEA
1 stop19h 29m
Multiple Airlines
Fri 9/1007:15
SEA
-
BHD
2 stops29h 15m
Multiple Airlines
Deal found 31/7£680
Thu 17/906:30
BHD
-
SEA
1 stop13h 05m
British Airways
Sun 20/906:15
SEA
-
BHD
2 stops20h 15m
British Airways
Deal found 28/7£705
Wed 25/1109:15
BHD
-
SEA
1 stop15h 35m
British Airways
Sun 29/1118:45
SEA
-
BHD
1 stop14h 05m
British Airways
Deal found 29/7£706
Wed 26/806:10
BFS
-
SEA
2 stops22h 30m
Multiple Airlines
Wed 2/919:00
SEA
-
BFS
2 stops17h 40m
Multiple Airlines
Deal found 29/7£708
Wed 26/820:35
BHD
-
SEA
1 stop23h 00m
British Airways
Wed 2/913:24
SEA
-
BHD
2 stops18h 16m
British Airways
Deal found 29/7£715
Sat 19/906:20
BFS
-
SEA
2 stops22h 20m
Multiple Airlines
Fri 25/915:40
SEA
-
BFS
3 stops23h 40m
Multiple Airlines
Deal found 29/7£856

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 1 August 2026.

Round-trip from

£641

One-way from

£496
3/9-8/9
  • 3/9-8/9
  • 4 total stops
  • 40h 35m total
  • Northern Ireland to Seattle
Search Deals
3/1
  • 3/1
  • 2 total stops
  • 51h 00m 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 1 August 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

BFS - SEA

BFSSEA

Belfast Intl

Thu 3/9

06:10-20:40

2 stops22h 30m

Seattle/Tacoma Intl

Tue 8/9

19:00-21:05

2 stops18h 05m

£641

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 5/10

10:35-20:14

1 stop17h 39m

Seattle/Tacoma Intl

Fri 9/10

07:15-13:50

2 stops22h 35m

£669

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 5/10

08:45-20:14

1 stop19h 29m

Seattle/Tacoma Intl

Fri 9/10

07:15-20:30

2 stops29h 15m

£680
Fastest return journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 17/9

06:30-11:35

1 stop13h 05m

Seattle/Tacoma Intl

Sun 20/9

20:20-18:45

1 stop14h 25m

£705

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 25/11

09:15-16:50

1 stop15h 35m

Seattle/Tacoma Intl

Sun 29/11

18:45-16:50

1 stop14h 05m

£706

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sat 19/9

06:20-20:40

2 stops22h 20m

Seattle/Tacoma Intl

Fri 25/9

15:40-23:20

3 stops23h 40m

£856
Cheapest one-way

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sun 3/1

22:00-17:00

2 stops51h 00m

£496

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sun 3/1

20:00-17:00

2 stops29h 00m

£522
Fastest single journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sun 3/1

20:25-16:50

1 stop28h 25m

£767

Flights are sorted by cheapest return flights first.

Deals found on 28/7

Sorted by cheapest first

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 £705, 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
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.

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.