Find flights
When to book
Airlines
FAQs

Cheap flights from Belfast to Seattle from £462

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 6/8. Fares are subject to change and may not be available on all flights or dates of travel.
BHD — SEA
6 Jun — 13 Jun1
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 7 May 2026.

Tue 1/920:25
BHD
-
SEA
1 stop23h 10m
Multiple Airlines
Tue 22/913:24
SEA
-
BHD
2 stops17h 56m
Multiple Airlines
Deal found 6/5£724
Wed 4/1109:15
BHD
-
SEA
1 stop15h 40m
British Airways
Sun 8/1114:46
SEA
-
BHD
2 stops39h 29m
British Airways
Deal found 6/5£749
Thu 10/909:35
BHD
-
SEA
1 stop16h 50m
British Airways
Mon 14/906:24
SEA
-
BHD
2 stops22h 31m
British Airways
Deal found 5/5£772
Sat 20/621:40
BFS
-
SEA
3 stops44h 00m
Multiple Airlines
Sat 27/610:45
SEA
-
BFS
3 stops28h 40m
Multiple Airlines
Deal found 6/5£1,035

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 May 2026.

Round-trip from

£724

One-way from

£462
1/9-22/9
  • 1/9-22/9
  • 3 total stops
  • 41h 06m total
  • Belfast to Seattle
Search Deals
6/8
  • 6/8
  • 3 total stops
  • 44h 05m 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 May 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

BHD - SEA

BHDSEA

Belfast City

Tue 1/9

20:25-11:35

1 stop23h 10m

Seattle/Tacoma Intl

Tue 22/9

13:24-15:20

2 stops17h 56m

£724
Fastest return journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 10/9

09:35-18:25

1 stop16h 50m

Seattle/Tacoma Intl

Mon 14/9

06:24-12:55

2 stops22h 31m

£772

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 3/9

20:35-11:35

1 stop23h 00m

Seattle/Tacoma Intl

Mon 7/9

15:47-18:45

2 stops18h 58m

£810

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sat 20/6

21:40-09:40

3 stops44h 00m

Seattle/Tacoma Intl

Sat 27/6

19:10-20:50

2 stops17h 40m

£1,053
Cheapest one-way

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Thu 6/8

06:40-18:45

3 stops44h 05m

£462

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sun 2/8

19:20-18:45

3 stops55h 25m

£469

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 6/8

16:00-16:00

3 stops32h 00m

£496

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sun 2/8

17:00-18:45

2 stops33h 45m

£632
Fastest single journey

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 3/8

18:30-11:35

1 stop25h 05m

£795

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sun 2/8

15:50-11:35

1 stop27h 45m

£823

Flights are sorted by cheapest return flights first.

Deals found on 5/5

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.

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 May 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
11,669 reviews
Check prices

Crew

7.9

Food

6.4

Overall

7.1

Comfort

7.2

Boarding

7.5

Entertainment

6.9

Reviews

1 / 20
6.0
Good

Charleen,May 2026

POS - MIA

If I had any other choice in getting to my destination, I would have used it
American Airlines
7.1
Good
11,669 reviews
American Airlines
7.1
Good
11,669 reviews
Check prices

Crew

7.9

Food

6.4

Overall

7.1

Comfort

7.2

Boarding

7.5

Entertainment

6.9

Reviews

1 / 20
6.0
Good

Charleen,May 2026

POS - MIA

If I had any other choice in getting to my destination, I would have used it

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 £772, British Airways can have you in Seattle from Belfast in 16h 50m. 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

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 7 May 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£552Average£552FlexibilityNo 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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.