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Cheap flights from Belfast to Seattle from £290

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 9/3. Fares are subject to change and may not be available on all flights or dates of travel.
BHD — SEA
6 Jan — 13 Jan1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Belfast to Seattle

Enter your travel dates to find the best prices.

Best flights from Belfast to Seattle
Discover carefully curated flight deals from Belfast to Seattle that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 7 December 2025.

Wed 28/106:35BHD - SEA
1 stop18h 20mBritish Airways
Sun 1/214:04SEA - BHD
2 stops40h 11mBritish Airways
Deal found 6/12£631
Sat 28/317:20BHD - SEA
1 stop29h 30mKLM
Wed 8/417:35SEA - BHD
1 stop31h 45mKLM
Deal found 6/12£1,106
Wed 4/206:35BHD - SEA
1 stop18h 20mBritish Airways
Sun 8/208:04SEA - BHD
2 stops21h 51mBritish Airways
Deal found 5/12£657

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 7 December 2025.

Round-trip from

£631

One-way from

£290
British Airways
  • British Airways
  • 28/1-1/2
  • 3 total stops
  • 58h 31m total
  • Belfast to Seattle
Search Deals
9/3
  • 9/3
  • 3 total stops
  • 27h 58m 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 7 December 2025.
Use the filters below to find and compare flights from Belfast to Seattle that are best for you.

Fly from

Belfast

Fly to

Seattle

Route

Depart

Return

Price

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 28/1

06:35-16:55

1 stop18h 20m

Seattle/Tacoma Intl

Sun 1/2

14:04-14:15

2 stops40h 11m

£631

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 4/2

06:35-16:55

1 stop18h 20m

Seattle/Tacoma Intl

Sun 8/2

08:04-13:55

2 stops21h 51m

£657

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 28/3

17:20-15:50

1 stop29h 30m

Seattle/Tacoma Intl

Wed 8/4

17:35-09:20

1 stop31h 45m

£1,106

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 9/3

22:20-19:18

3 stops27h 58m

£290

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 11/3

07:55-19:18

3 stops42h 23m

£304

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 11/3

11:50-19:18

3 stops38h 28m

£311

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Fri 13/3

14:25-19:18

3 stops35h 53m

£314

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 10/3

06:00-10:55

2 stops35h 55m

£325

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 10/3

09:25-10:55

2 stops32h 30m

£342

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 9/3

07:20-10:28

2 stops34h 08m

£369

Flights are sorted by cheapest return flights first.

Deals found on 7/12

Showing 1-10 of 19 results
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 7 December 2025.
Read through reviews of airlines operating flights from Belfast to Seattle, such as American Airlines and British Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.2
Good
11,044 reviews
Check prices

Entertainment

6.9

Food

6.5

Crew

8.0

Overall

7.2

Comfort

7.2

Boarding

7.5

Reviews

1 / 20
10.0
Excellent

Jeremy,Dec 2025

OKC - CLT

Was an okay flight. Had extra seat empty beside me so was able to stretch a bit
American Airlines
7.2
Good
11,044 reviews
American Airlines
7.2
Good
11,044 reviews
Check prices

Entertainment

6.9

Food

6.5

Crew

8.0

Overall

7.2

Comfort

7.2

Boarding

7.5

Reviews

1 / 20
10.0
Excellent

Jeremy,Dec 2025

OKC - CLT

Was an okay flight. Had extra seat empty beside me so was able to stretch a bit
British Airways
6.7
Okay
7,564 reviews
American Airlines
7.2
Good
11,044 reviews
Check prices

Entertainment

6.9

Food

6.5

Crew

8.0

Overall

7.2

Comfort

7.2

Boarding

7.5

Reviews

1 / 20
10.0
Excellent

Jeremy,Dec 2025

OKC - CLT

Was an okay flight. Had extra seat empty beside me so was able to stretch a bit

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 2 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 £631, British Airways can have you in Seattle from Belfast in 18h 20m. Airlines will cover a distance of 4472 mi.

  • What are the cheapest airlines flying from Belfast to Seattle round-trip?

    British Airways, at £441, was found to be the cheapest airline from Belfast to Seattle. An alternate airline flying to your destination would be American Airlines.

  • 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
Leavenworth
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 City to Seattle flights

Top 2 airlines flying from Belfast to Seattle

Discover the top 2 airlines 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 7 December 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£441Average£527FlexibilityNo cancel feeOn-time70%
Search British Airways flights
American AirlinesCheapest£563Average£563FlexibilityNo 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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