SEA

£347 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 31/5. 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
£696
Multiple Airlines
Tue 26/5Tue 2/6
BFS - SEA • 3 stops
Cheapest one-way flight
£347
Multiple Airlines
Sun 31/5
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

Tue, 26 May - Tue, 2 Jun
Multiple Airlines Logo
23:30 - 09:40
BFS
-
SEA
42h 10m
3 stops
Multiple Airlines Logo
15:40 - 23:20
SEA
-
BFS
23h 40m
3 stops
£696Multiple Airlines
Tue, 26 May - Tue, 2 Jun
Multiple Airlines Logo
08:20 - 20:40
BFS
-
SEA
20h 20m
2 stops
Multiple Airlines Logo
15:40 - 20:55
SEA
-
BFS
21h 15m
2 stops
£750Multiple Airlines
Fri, 22 May - Fri, 29 May
Multiple Airlines Logo
21:05 - 09:40
BFS
-
SEA
44h 35m
3 stops
Multiple Airlines Logo
15:40 - 23:20
SEA
-
BFS
23h 40m
3 stops
£759Multiple Airlines
Tue, 26 May - Tue, 2 Jun
Multiple Airlines Logo
23:30 - 09:40
BFS
-
SEA
42h 10m
3 stops
Multiple Airlines Logo
15:40 - 15:15
SEA
-
BFS
15h 35m
2 stops
£823Multiple Airlines
Fri, 22 May - Fri, 29 May
Multiple Airlines Logo
22:15 - 20:40
BFS
-
SEA
30h 25m
2 stops
Multiple Airlines Logo
15:40 - 23:20
SEA
-
BFS
23h 40m
3 stops
£832Multiple Airlines
Fri, 22 May - Fri, 29 May
Multiple Airlines Logo
07:05 - 16:59
BFS
-
SEA
17h 54m
2 stops
Multiple Airlines Logo
18:50 - 21:15
SEA
-
BFS
18h 25m
2 stops
£1,046Multiple Airlines
Mon, 31 Aug - Thu, 10 Sep
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
13:24 - 15:30
SEA
-
BHD
18h 06m
2 stops
£3,914British Airways
Mon, 31 Aug - Thu, 10 Sep
British Airways Logo
09:40 - 20:17
BHD
-
SEA
18h 37m
2 stops
British Airways Logo
13:24 - 15:30
SEA
-
BHD
18h 06m
2 stops
£3,918British Airways
Mon, 31 Aug - Thu, 10 Sep
British Airways Logo
11:35 - 18:25
BHD
-
SEA
14h 50m
1 stop
British Airways Logo
20:20 - 18:45
SEA
-
BHD
14h 25m
1 stop
£4,103British Airways
Useful Info

Good to know - Cheap tickets from Belfast to Seattle

Cheapest flight£347
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 £347 for a one-way ticket and £696 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 11572 reviews
7.5Boarding
7.2Comfort
6.9Entertainment
6.4Food
7.9Crew
Airline reviews

Was not able to do a online check-in because the American Airlines system doesn't store our visa or other passport information, allowing us to have a trouble-free check-in. We were forced to have to check-in at the counter which Changes are upgrade status given that we were not able to check in much earlier.

2.0 MediocreALLEN, Apr 2026
SAN - MIA
Read more American Airlines reviews

Was not able to do a online check-in because the American Airlines system doesn't store our visa or other passport information, allowing us to have a trouble-free check-in. We were forced to have to check-in at the counter which Changes are upgrade status given that we were not able to check in much earlier.

The plane was very creaky and lots of ringing. Plane was dirty and dingy. I couldn't hear the captain's announcements from the flight deck. Not sure if it was the captain or the audio equipment, but good thing there wasn't an emergency where we needed clear instructions. The overhead compartments were clearly full, but the flight crew allowed people to stand in the back with their carry on luggage. Then after everyone boarded, they had to go to the front to gate check their luggage because there was no room for their bags and then they returned to their seats...such a waste of time when clearly the overhead compartments were full when they originally boarded.

The new planes (American Eagle) are beautiful and especially comfortable. The flight attendants are consistently professional and courteous. And, while it may seem inconsequential, the new liquid tube of coffee creamer—in contrast to the powdered coffee creamer—makes all the difference in a cup of coffee.

I have been flying American Airlines—almost exclusively—for years. The airline is consistent with fares, timely departures/arrivals, and customer service, whether on the phone or in the air.

Cleared standby and gave up my seat. Terrible policy and boarding experience

Flight was delayed and they gave up my seat on my connection, even when I could still make the flight

Checked bag was severely damaged. Whole corner was riped off including 1 of 4 wheels gone. Insulation exposed. This made it not possible to fly with on my next-day American Airlines flight.

The WiFi would not connect enough for me to do my actual work. It permaspooled, disconnected, said it was connected, then wouldn't open an email... it was frustrating. I am not a tall person, 5'4" - and I felt cramped with little room to reach into my bag under the seat in front of me. I feel sorry for anyone taller than me having to fly. the one positive thing I will add, is the overhead bins are roomy enough to manage more bags than other carriers.

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.

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

Information on your arrival and departure airports