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Cheap flights from Belfast Intl Airport 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.
BFS — SEA
6 Jan — 13 Jan1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Belfast Intl to Seattle

Enter your travel dates to find the best prices.

One-way flights from Belfast Intl to Seattle
Search for one-way flight options from Belfast Intl to Seattle. Find affordable one-way fares based on user searches. Data last updated 7 December 2025.

Mon 9/322:20BFS - SEA
3 stops27h 58mMultiple Airlines
Deal found 7/12£290
Wed 11/307:55BFS - SEA
3 stops42h 23mMultiple Airlines
Deal found 7/12£304
Fri 13/314:25BFS - SEA
3 stops35h 53mMultiple Airlines
Deal found 7/12£314
Sun 15/320:45BFS - SEA
3 stops53h 33mMultiple Airlines
Deal found 7/12£321
Tue 10/306:00BFS - SEA
2 stops35h 55mMultiple Airlines
Deal found 7/12£325
Thu 12/316:35BFS - SEA
3 stops33h 45mMultiple Airlines
Deal found 7/12£376
Sat 14/322:25BFS - SEA
3 stops33h 17mMultiple Airlines
Deal found 7/12£385

Cheapflights Fare Finder

 
Customise your flight search to find flights from Belfast Intl 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 Intl Airport to Seattle that are best for you.

Fly from

Belfast Intl

Fly to

Seattle

Route

Depart

Return

Price

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

BFS - SEA

BFSSEA

Belfast Intl

Fri 13/3

14:25-19:18

3 stops35h 53m

£314

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sun 15/3

20:45-19:18

3 stops53h 33m

£321

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 10/3

06:00-10:55

2 stops35h 55m

£325

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 12/3

16:35-19:20

3 stops33h 45m

£376

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sat 14/3

22:25-00:42

3 stops33h 17m

£385

Flights are sorted by cheapest return flights first.

Deals found on 7/12

Best time to book a flight from Belfast Intl to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Belfast Intl 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.

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 reviews from past customers who have flown with American Airlines and British Airways from Belfast Intl Airport to Seattle. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
American Airlines
7.2
Good
11,044 reviews
Check prices

Crew

8.0

Comfort

7.2

Entertainment

6.9

Overall

7.2

Food

6.5

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

Crew

8.0

Comfort

7.2

Entertainment

6.9

Overall

7.2

Food

6.5

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

Crew

8.0

Comfort

7.2

Entertainment

6.9

Overall

7.2

Food

6.5

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 Intl 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 Intl?

    Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly into when you book flights from Belfast Intl to Seattle. 2 airlines have flights to Seattle/Tacoma Intl from Belfast Intl on a regular basis. Booking flights from Belfast Intl to Seattle/Tacoma Intl should not be difficult; the airport handles an average of 0 inbound flights from Belfast Intl per day.

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

    Currently priced at £441, British Airways will fly you from Belfast Intl Airport to Seattle and back. In addition to British Airways, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on American Airlines for as low as £563.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Belfast Intl 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

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Alternative routes for Belfast Intl 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 Intl to Seattle

Discover the top 2 airlines that operate flights from Belfast Intl 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 Intl to Seattle?

Cheapflights makes it easy to find Belfast Intl to Seattle flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Belfast Intl to Seattle?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Seattle from Belfast Intl.

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

Yes, we can. To see specific flights from Belfast Intl to Seattle with no change fees, users can toggle flexible booking options after using the search form above to find flights.

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

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Seattle from Belfast Intl today and book when prices fit your budget.

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