SEA

£348 Find Cheap Flights from Belfast to Seattle

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Belfast to Seattle departing on 1/10. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Seattle

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Belfast to Seattle, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Belfast to Seattle, as well as popular online travel agencies
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Everything you should know

Cheapest return fare
£700
Multiple Airlines
Mon 14/9Sun 20/9
BHD - SEA • 2 stops
Cheapest one-way flight
£348
Multiple Airlines
Thu 1/10
BFS - SEA • 3 stops
Start a new search
KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Seattle!
Flight Deals
Useful Info
Flight Deals

Cheap Flights from Belfast to Seattle

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Belfast to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from Belfast to Seattle

Mon, 14 Sep - Sun, 20 Sep
Multiple Airlines Logo
08:45 - 20:40
BHD
-
SEA
19h 55m
2 stops
Multiple Airlines Logo
19:00 - 20:30
SEA
-
BHD
17h 30m
2 stops
£700Multiple Airlines
Mon, 14 Sep - Sun, 20 Sep
Multiple Airlines Logo
08:15 - 20:40
BFS
-
SEA
20h 25m
2 stops
Multiple Airlines Logo
15:40 - 20:15
SEA
-
BFS
20h 35m
2 stops
£701Multiple Airlines
Mon, 14 Sep - Sun, 20 Sep
British Airways Logo
19:35 - 17:29
BHD
-
SEA
29h 54m
2 stops
British Airways Logo
20:20 - 18:45
SEA
-
BHD
14h 25m
1 stop
£729British Airways
Mon, 14 Sep - Sun, 20 Sep
British Airways Logo
19:35 - 11:35
BHD
-
SEA
24h 00m
1 stop
British Airways Logo
20:20 - 18:45
SEA
-
BHD
14h 25m
1 stop
£730British Airways
Mon, 14 Sep - Sun, 20 Sep
Multiple Airlines Logo
08:15 - 20:40
BFS
-
SEA
20h 25m
2 stops
Multiple Airlines Logo
15:40 - 22:35
SEA
-
BFS
22h 55m
3 stops
£731Multiple Airlines
Wed, 13 May - Wed, 20 May
British Airways Logo
11:35 - 00:36
BHD
-
SEA
21h 01m
2 stops
British Airways Logo
13:30 - 12:00
SEA
-
BHD
14h 30m
1 stop
£754British Airways
Wed, 14 Oct - Sun, 18 Oct
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
13:30 - 10:30
SEA
-
BHD
13h 00m
1 stop
£763British Airways
Wed, 14 Oct - Sun, 18 Oct
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
11:34 - 17:40
SEA
-
BHD
22h 06m
2 stops
£769British Airways
Wed, 13 May - Wed, 20 May
British Airways Logo
11:35 - 18:25
BHD
-
SEA
14h 50m
1 stop
British Airways Logo
13:30 - 12:00
SEA
-
BHD
14h 30m
1 stop
£773British Airways
Mon, 14 Sep - Sun, 20 Sep
Multiple Airlines Logo
20:55 - 18:32
BFS
-
SEA
29h 37m
3 stops
Multiple Airlines Logo
15:40 - 22:35
SEA
-
BFS
22h 55m
3 stops
£773Multiple Airlines
Useful Info

Good to know - Cheap tickets from Belfast to Seattle

Cheapest flight£348
Flight from Belfast Intl Airport to Seattle

When to book flights from Belfast to Seattle

Are your dates flexible? Find out the best times to travel from Belfast to Seattle based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Belfast to Seattle

  • What is the cheapest flight from Belfast to Seattle?

    In the last 3 days, the lowest price for a flight from Belfast to Seattle was £348 for a one-way ticket and £700 for a return.

  • Which airports will I be using when flying from Belfast to Seattle?

    There are 2 airports in Belfast (Belfast Intl and Belfast City.) and only 1 airport in Seattle (Seattle/Tacoma Intl). The cheapest flights are generally found on the Belfast City Airport to Seattle/Tacoma Intl flight route.

  • Which aircraft models fly most regularly from Belfast to Seattle?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Belfast to Seattle?

    oneworld is the only airline alliance operating flights between Belfast and Seattle.

  • How does KAYAK find such low prices on flights from Belfast to Seattle?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Belfast to Seattle.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Belfast to Seattle?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Belfast is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Belfast to Seattle?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to Seattle with an airline and back to Belfast with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Belfast to Seattle?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Belfast up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Belfast to Seattle

 
See real verified KAYAK customer reviews for airlines flying from Belfast to Seattle. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Belfast to Seattle? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.1
American AirlinesOverall score based on 11593 reviews
7.2Comfort
7.5Boarding
7.9Crew
6.9Entertainment
6.4Food
Airline reviews

The seat was comfortable, the attendants were very nice and WiFi made my life so much easier with work. Kudos!

10.0 ExcellentMadhujit, Apr 2026
DFW - CLE
Read more American Airlines reviews

The seat was comfortable, the attendants were very nice and WiFi made my life so much easier with work. Kudos!

AA was a very good experience. The employees are wonderful

Flight was 3 hours delayed. They gave our plan to two other routes. Need to knock that off.

To have arrived on time and not 3 hours late after having already spent $100 to change to an earlier flight, only to arrive back home close to the original flight time.

No gate in Rome. Had stairs. Got separated from my wife in a wheel chair. Customs was a zoo. If AA doesnt have landing rights, it should be advertised.

I almost missed my flight and they helped me out enormously

Plane was super cold. No entertainment unless you were with mileage program Getting off the plane was super slow

British Airways is an excellent airline. Comfort, food and airline personnel.

Older airplane with worn out seats. No entertainment system at all. Connecting to Wi-Fi was problematic and hit and miss.

An delay of almost 3 hours while passengers were already in the plane kept us very uncomfortable. The food was also very limited. A bad experience overall.

Everything you need to know for your flight from Belfast to Seattle

Information on your arrival and departure airports

Seattle (SEA)