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Cheap flights from Belfast to Seattle from £495

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.
BHD — SEA
1 Sep — 8 Sep1
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 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£639
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£667
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£678
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£704
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£704
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£707
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£713
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£854

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 August 2026.

Round-trip from

£639

One-way from

£495
3/9-8/9
  • 3/9-8/9
  • 4 total stops
  • 40h 35m total
  • Belfast to Seattle
Search Deals
3/1
  • 3/1
  • 2 total stops
  • 51h 00m 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 August 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

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

£639

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

£667

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

£678
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

£704

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

£704

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

£854
Cheapest one-way

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sun 3/1

22:00-17:00

2 stops51h 00m

£495

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sun 3/1

20:00-17:00

2 stops29h 00m

£520
Fastest single journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sun 3/1

20:25-16:50

1 stop28h 25m

£765

Flights are sorted by cheapest return flights first.

Deals found on 28/7

Sorted by cheapest first

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.

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 0 airlines. 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 £704, British Airways can have you in Seattle from Belfast in 13h 05m. 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
Federal Way
SeaTac

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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

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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