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Cheap flights from Belfast to Seattle from £404

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 25/10. Fares are subject to change and may not be available on all flights or dates of travel.
BHD — SEA
16 Jul — 23 Jul1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Belfast to Seattle

Enter your travel dates to find the best prices.

Cheapest flights from Belfast to Seattle
Explore the most affordable flight options available from Belfast to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 June 2026.

Wed 16/920:35
BHD
-
SEA
1 stop23h 00m
British Airways
Wed 7/1011:34
SEA
-
BHD
2 stops18h 01m
British Airways
Deal found 13/6£574
Tue 15/909:40
BHD
-
SEA
2 stops19h 56m
British Airways
Tue 6/1020:20
SEA
-
BHD
1 stop13h 15m
British Airways
Deal found 15/6£578
Tue 15/909:50
BHD
-
SEA
1 stop33h 57m
KLM
Tue 6/1017:45
SEA
-
BHD
1 stop15h 10m
KLM
Deal found 15/6£596
Thu 1/1020:35
BHD
-
SEA
1 stop23h 00m
British Airways
Mon 5/1013:30
SEA
-
BHD
1 stop15h 25m
British Airways
Deal found 11/6£603
Wed 14/1006:30
BHD
-
SEA
2 stops18h 40m
British Airways
Sun 18/1014:12
SEA
-
BHD
2 stops19h 28m
British Airways
Deal found 11/6£608
Fri 10/722:10
BFS
-
SEA
2 stops27h 00m
Multiple Airlines
Thu 16/719:10
SEA
-
BFS
2 stops16h 20m
Multiple Airlines
Deal found 11/6£724
Wed 15/722:45
BFS
-
SEA
3 stops43h 22m
Multiple Airlines
Tue 21/715:40
SEA
-
BFS
3 stops20h 10m
Multiple Airlines
Deal found 15/6£750

Find flight deals from Belfast to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Belfast (BF1) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 16 June 2026.

Round-trip from

£574

One-way from

£404
British Airways
  • British Airways
  • 16/9-7/10
  • 2 total stops
  • 37h 25m total
  • Belfast to Seattle
Search Deals
25/10
  • 25/10
  • 2 total stops
  • 29h 40m total
  • Belfast to Seattle
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Belfast 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 16 June 2026.
Use the filters below to find and compare flights from Belfast 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

Wed 16/9

20:35-11:35

1 stop23h 00m

Seattle/Tacoma Intl

Wed 7/10

20:20-18:45

1 stop14h 25m

£574

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 15/9

09:50-11:47

1 stop33h 57m

Seattle/Tacoma Intl

Tue 6/10

17:45-16:55

1 stop15h 10m

£596

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 1/10

20:35-11:35

1 stop23h 00m

Seattle/Tacoma Intl

Mon 5/10

13:30-12:55

1 stop15h 25m

£603

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 14/10

16:05-11:35

1 stop27h 30m

Seattle/Tacoma Intl

Sun 18/10

20:20-20:35

1 stop16h 15m

£603

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 10/7

22:10-17:10

2 stops27h 00m

Seattle/Tacoma Intl

Thu 16/7

19:10-19:30

2 stops16h 20m

£724

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 15/7

22:45-10:07

3 stops43h 22m

Seattle/Tacoma Intl

Tue 21/7

15:40-19:50

3 stops20h 10m

£750
Cheapest one-way

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sun 25/10

20:40-17:50

1 stop28h 10m

£448

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sun 25/10

06:50-19:20

3 stops43h 30m

£448

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 3/8

19:35-17:10

2 stops29h 35m

£502
Fastest single journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 3/8

09:40-22:56

2 stops21h 16m

£529

Flights are sorted by cheapest return flights first.

Deals found on 15/6

Showing 1-10 of 11 resultsSorted by cheapest first
1
2

Best time to book a flight from Belfast to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Belfast 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 Belfast to Seattle
No data available for this route at this time. Please check back soon.

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated 16 June 2026.
Read through reviews of airlines operating flights from Belfast to Seattle, such as American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.1
Good
11,666 reviews
Check prices

Overall

7.1

Crew

7.9

Comfort

7.2

Entertainment

6.8

Boarding

7.5

Food

6.4

Reviews

1 / 20
10.0
Excellent

Beatriz,May 2026

HEL - DFW

Very modern and confortable plane. Dinner was delicious. Whole crew were polite and perfect.
American Airlines
7.1
Good
11,666 reviews
American Airlines
7.1
Good
11,666 reviews
Check prices

Overall

7.1

Crew

7.9

Comfort

7.2

Entertainment

6.8

Boarding

7.5

Food

6.4

Reviews

1 / 20
10.0
Excellent

Beatriz,May 2026

HEL - DFW

Very modern and confortable plane. Dinner was delicious. Whole crew were polite and perfect.

Related info for your journey

Find useful and relevant information for your journey from Belfast 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 Belfast?

    Most people fly into Seattle/Tacoma Intl (SEA) if they book a flight to Seattle from Belfast. On average, Seattle/Tacoma Intl has 0 inbound flights from Belfast per day from 1 airline. Seattle/Tacoma Intl is conveniently located just 11.4 mi from Seattle’s city center.

  • How long is the flight from Belfast to Seattle?

    For as low as £574, British Airways can have you in Seattle from Belfast in 23h. Airlines will cover a distance of 4472 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

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

  • How can I find direct flights from Belfast to Seattle?

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

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

    Yes. Cheapflights offers flight deals from Belfast 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.

Alternative routes for Belfast to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
Belfast Intl to Seattle flights
Belfast City to Seattle flights

Top airline flying from Belfast to Seattle

Discover the top airline that operate flights from Belfast 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 16 June 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£559Average£559FlexibilityNo 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 Belfast to Seattle?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Belfast 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 Belfast to Seattle?

Millions of users choose and trust Cheapflights to book the best flight deals from Belfast to Seattle for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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

Certainly. Search results for flights to Seattle from Belfast shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Yes, Cheapflights offers price alerts on Belfast to Seattle flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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