SEA

£457 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 11/7. 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
£507
Delta
Mon 26/1Mon 2/2
BHD - SEA • 1 stop
Cheapest one-way flight
£457
Multiple Airlines
Sat 11/7
BFS - SEA • 3 stops
Top airlines
Delta
Cheapest • from £507 (return)
American Airlines
Best reviews • 7.2 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Seattle!
Flight Deals
Booking Insights
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, 26 Jan - Mon, 2 Feb
Delta Logo
17:20 - 11:50
BHD
-
SEA
26h 30m
1 stop
Delta Logo
15:05 - 16:50
SEA
-
BHD
17h 45m
1 stop
£507Delta
Mon, 26 Jan - Mon, 2 Feb
Delta Logo
17:20 - 16:55
BHD
-
SEA
31h 35m
2 stops
Delta Logo
09:25 - 16:50
SEA
-
BHD
23h 25m
2 stops
£517Delta
Sat, 7 Mar - Mon, 9 Mar
British Airways Logo
06:35 - 16:55
BHD
-
SEA
18h 20m
1 stop
British Airways Logo
19:50 - 18:35
SEA
-
BHD
15h 45m
1 stop
£534British Airways
Sat, 7 Mar - Mon, 9 Mar
British Airways Logo
11:35 - 16:55
BHD
-
SEA
13h 20m
1 stop
British Airways Logo
19:50 - 18:35
SEA
-
BHD
15h 45m
1 stop
£535British Airways
Wed, 4 Feb - Sun, 8 Feb
British Airways Logo
06:35 - 16:55
BHD
-
SEA
18h 20m
1 stop
British Airways Logo
14:10 - 10:40
SEA
-
BHD
36h 30m
2 stops
£538British Airways
Wed, 4 Feb - Sun, 8 Feb
British Airways Logo
12:25 - 16:55
BHD
-
SEA
12h 30m
1 stop
British Airways Logo
14:10 - 10:40
SEA
-
BHD
36h 30m
2 stops
£539British Airways
Wed, 4 Feb - Sun, 8 Feb
British Airways Logo
06:35 - 22:07
BHD
-
SEA
23h 32m
2 stops
British Airways Logo
14:10 - 10:40
SEA
-
BHD
36h 30m
2 stops
£542British Airways
Wed, 4 Feb - Sun, 8 Feb
British Airways Logo
06:35 - 22:07
BHD
-
SEA
23h 32m
2 stops
British Airways Logo
14:10 - 10:40
SEA
-
BHD
36h 30m
2 stops
£543British Airways
Wed, 4 Feb - Sun, 8 Feb
British Airways Logo
11:25 - 16:55
BHD
-
SEA
13h 30m
1 stop
British Airways Logo
18:50 - 16:50
SEA
-
BHD
14h 00m
1 stop
£545British Airways
Fri, 27 Feb - Fri, 6 Mar
Multiple Airlines Logo
13:25 - 12:10
BFS
-
SEA
30h 45m
2 stops
Multiple Airlines Logo
14:00 - 18:45
SEA
-
BFS
20h 45m
2 stops
£675Multiple Airlines
Booking Insights

KAYAK's insights & trends for Belfast to Seattle flights

Get data-powered insights and trends into flights from Belfast to Seattle to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Belfast to Seattle?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest return tickets from Belfast to Seattle were found on Delta (£507) and British Airways (£534).

Good to know - Cheap tickets from Belfast to Seattle

Cheapest flight£457
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 £457 for a one-way ticket and £507 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 airlines 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.
7.2
American AirlinesOverall score based on 11132 reviews
7.5Boarding
7.2Comfort
6.4Food
8.0Crew
6.9Entertainment
Airline reviews

AA should improve their in air internet & entertainment options. Seems unreasonable to charge $20/hr and should have some form of free connections. The entertainment options are also pretty limited, movies are outdated and the series only show 3-5 episodes.

6.0 GoodJennifer, Jan 2026
DFW - BOS
Read more American Airlines reviews

AA should improve their in air internet & entertainment options. Seems unreasonable to charge $20/hr and should have some form of free connections. The entertainment options are also pretty limited, movies are outdated and the series only show 3-5 episodes.

We were upgraded to First Class and it was a great flight

Amazing I love American. I’ll never fly anyone else if I can help it.

I love American. I’ll never fly anyone else if I can help it.

Flight delay and multiple gate changes including a change near boarding time to another terminal, which in DFW is a pain. Pre-boarding delay and also a further delay on the ground after boarding. About an hour and a half total delay.

On the plus side, crew was attentive, drinks were cold, and in-flight entertainment selection was better than some other airlines. On the negative aide, Plane was delayed almost an hour, either no announcements from the gate crew. Biscoff cookies are gross, appreciate airlines that give a choice. Also, crew had no personality or enthusiasm at all.

Little warm on the plane and delayed for an hour

Flight was delayed because of a bird strike. They had another plane available within 45 minutes.

The business class seats are dated and uncomfortable. The space is bare minimum and there is absolutely no privacy. For $4K, this is not what I expect.

Flight, food and crew were all good, friendly and very satisfactory.

My touch screen at my seat wasn't working, the films BA advertised on the website for this flight were not available, and the plane was a little dated, food was good and the staff were good, just let down by the aircraft facilities.

Did not like the seating configuration at all with 2+3+2 in business class. Lacking total privacy and comfort

Check-in experience, for business call please provide a premium experience

Lost my luggage, ran out of food choices in business class, ground crew was completely unapologetic.

Excellent. The crew and flight were great. Checking in was easy and everyone was very helpful.

Entertainment devices on A380 need to be fixed, the seats might do with updates.

Everything. Employees offered to help me because I had to use a cane.

Check-in and boarding were great. On flight staff were rude and disrespectful. Paid for extra room and found it incredibly cramped. Bathrooms kept in poor condition. Overall negative experience.

Great seat in premium economy, great food and drinks throughout lots of in flight entertainment. 1 hour 40 min delayed flying out , 2 1/2 hour wait at passport control in tampa

My seat cushion was poor. The cushion was compressed and was uncomfortable for such a long flight.

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

Information on your arrival and departure airports