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Cheap flights from Belfast to Seattle from £383

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 29/10. Fares are subject to change and may not be available on all flights or dates of travel.
BHD — SEA
1 Aug — 8 Aug1
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 2 July 2026.

Thu 10/920:35
BHD
-
SEA
1 stop23h 00m
British Airways
Thu 1/1013:38
SEA
-
BHD
2 stops17h 52m
British Airways
Deal found 28/6£679
Thu 10/909:50
BHD
-
SEA
2 stops22h 05m
Delta
Thu 1/1007:15
SEA
-
BHD
2 stops18h 05m
Delta
Deal found 28/6£701
Thu 24/920:35
BHD
-
SEA
1 stop29h 50m
British Airways
Sun 27/920:20
SEA
-
BHD
1 stop14h 25m
British Airways
Deal found 28/6£709
Thu 10/906:10
BFS
-
SEA
2 stops22h 30m
Multiple Airlines
Thu 1/1019:00
SEA
-
BFS
2 stops20h 05m
Multiple Airlines
Deal found 27/6£710
Thu 13/806:40
BFS
-
SEA
3 stops35h 00m
Multiple Airlines
Thu 20/819:00
SEA
-
BFS
3 stops20h 00m
Multiple Airlines
Deal found 29/6£799
Fri 14/807:20
BFS
-
SEA
3 stops45h 40m
Multiple Airlines
Fri 21/814:10
SEA
-
BFS
3 stops25h 10m
Multiple Airlines
Deal found 30/6£818
Sun 2/821:25
BFS
-
SEA
3 stops44h 40m
Multiple Airlines
Sat 8/805:50
SEA
-
BFS
3 stops19h 45m
Multiple Airlines
Deal found 30/6£1,026

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 2 July 2026.

Round-trip from

£679

One-way from

£383
British Airways
  • British Airways
  • 10/9-1/10
  • 2 total stops
  • 37h 25m total
  • Belfast to Seattle
Search Deals
29/10
  • 29/10
  • 3 total stops
  • 43h 50m 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 2 July 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

Thu 10/9

20:35-11:35

1 stop23h 00m

Seattle/Tacoma Intl

Thu 1/10

13:38-15:30

2 stops17h 52m

£679

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 24/9

09:35-11:35

1 stop34h 00m

Seattle/Tacoma Intl

Sun 27/9

10:59-18:45

2 stops23h 46m

£709

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 3/12

15:25-16:55

1 stop33h 30m

Seattle/Tacoma Intl

Mon 7/12

18:50-16:05

1 stop13h 15m

£709

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 10/9

06:10-20:40

2 stops22h 30m

Seattle/Tacoma Intl

Thu 1/10

19:00-23:05

2 stops20h 05m

£710

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 13/8

06:40-09:40

3 stops35h 00m

Seattle/Tacoma Intl

Thu 20/8

19:00-23:00

3 stops20h 00m

£799

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 14/8

07:20-18:45

3 stops43h 25m

Seattle/Tacoma Intl

Fri 21/8

19:10-21:15

2 stops18h 05m

£999

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sun 2/8

21:25-21:07

2 stops31h 42m

Seattle/Tacoma Intl

Sat 8/8

08:00-09:35

2 stops17h 35m

£1,095
Cheapest one-way

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 29/10

06:30-19:20

3 stops43h 50m

£383

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 29/10

07:40-17:55

1 stop17h 15m

£429

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 8/7

22:45-21:00

3 stops54h 15m

£505

Flights are sorted by cheapest return flights first.

Deals found on 2/7

Showing 1-10 of 14 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 2 July 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
11,769 reviews
Check prices

Food

6.4

Overall

7.1

Comfort

7.2

Boarding

7.5

Crew

7.9

Entertainment

6.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2024

LHR - SAN

This was the best flight I have experienced in all the years I have been f doing this journey with BA. Flight, food and service A1. Well done BA.
American Airlines
7.1
Good
11,769 reviews
American Airlines
7.1
Good
11,769 reviews
Check prices

Food

6.4

Overall

7.1

Comfort

7.2

Boarding

7.5

Crew

7.9

Entertainment

6.8

Reviews

1 / 20
10.0
Excellent

Anonymous,Jan 2024

LHR - SAN

This was the best flight I have experienced in all the years I have been f doing this journey with BA. Flight, food and service A1. Well done BA.

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 £679, British Airways can have you in Seattle from Belfast in 23h. Airlines will cover a distance of 4472 mi.

  • 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

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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 2 July 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£566Average£566FlexibilityNo 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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