SEA

£626 Find Cheap Flights from Belfast to Seattle

This is the cheapest return flight price found by a KAYAK user in the last 72 hours by searching for a flight from Belfast to Seattle departing on 29/4. 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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41.299.237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest return fare
£626
Multiple Airlines
Wed 29/4Wed 6/5
BFS - SEA • 2 stops
Cheapest one-way flight
£732
Multiple Airlines
Fri 24/4
BHD - SEA • 3 stops
Top airlines
Cheapest • from £706 (return)
Best reviews • 7.1 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

Wed, 29 Apr - Wed, 6 May
Multiple Airlines Logo
07:35 - 17:55
BFS
-
SEA
18h 20m
2 stops
Multiple Airlines Logo
19:00 - 17:05
SEA
-
BFS
14h 05m
2 stops
£626Multiple Airlines
Wed, 29 Apr - Wed, 6 May
Multiple Airlines Logo
07:35 - 17:55
BFS
-
SEA
18h 20m
2 stops
Multiple Airlines Logo
19:00 - 17:05
SEA
-
BFS
14h 05m
2 stops
£637Multiple Airlines
Wed, 29 Apr - Wed, 6 May
Multiple Airlines Logo
07:00 - 20:40
BHD
-
SEA
21h 40m
2 stops
Multiple Airlines Logo
15:40 - 19:40
SEA
-
BHD
20h 00m
2 stops
£697Multiple Airlines
Wed, 29 Apr - Wed, 6 May
Multiple Airlines Logo
07:00 - 20:40
BHD
-
SEA
21h 40m
2 stops
Multiple Airlines Logo
15:40 - 19:40
SEA
-
BHD
20h 00m
2 stops
£698Multiple Airlines
Wed, 29 Apr - Wed, 6 May
Multiple Airlines Logo
10:05 - 22:38
BHD
-
SEA
20h 33m
2 stops
Multiple Airlines Logo
13:30 - 13:35
SEA
-
BHD
16h 05m
1 stop
£700Multiple Airlines
Wed, 29 Apr - Wed, 6 May
KLM Logo
09:50 - 16:30
BHD
-
SEA
14h 40m
1 stop
KLM Logo
17:45 - 16:55
SEA
-
BHD
15h 10m
1 stop
£706KLM
Wed, 23 Sep - Sun, 27 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
£723British Airways
Wed, 23 Sep - Sun, 27 Sep
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
06:24 - 10:30
SEA
-
BHD
20h 06m
2 stops
£726British Airways
Wed, 29 Apr - Wed, 6 May
KLM Logo
09:50 - 16:30
BHD
-
SEA
14h 40m
1 stop
KLM Logo
17:45 - 09:20
SEA
-
BHD
31h 35m
1 stop
£732KLM
Wed, 23 Sep - Sun, 27 Sep
British Airways Logo
10:05 - 21:09
BHD
-
SEA
19h 04m
2 stops
British Airways Logo
06:24 - 10:30
SEA
-
BHD
20h 06m
2 stops
£735British Airways
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 KLM (£706) and British Airways (£723).

Good to know - Cheap tickets from Belfast to Seattle

Cheapest flight£626
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 £732 for a one-way ticket and £626 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 11551 reviews
6.9Entertainment
7.9Crew
7.5Boarding
7.2Comfort
6.4Food
Airline reviews

Incoming flight was delayed, delaying boarding. It then took 30 mins to take off. Took 20 mins to get to a gate because they changed the gate last minute, crew weren’t ready so there was no one staffed to work the jet bridge. Boarding was so disorganized as is usual with American because everyone just stands around the gate regardless of boarding group.

2.0 MediocreSerena, Apr 2026
DCA - TPA
Read more American Airlines reviews

Incoming flight was delayed, delaying boarding. It then took 30 mins to take off. Took 20 mins to get to a gate because they changed the gate last minute, crew weren’t ready so there was no one staffed to work the jet bridge. Boarding was so disorganized as is usual with American because everyone just stands around the gate regardless of boarding group.

Early morning flight and no food in First Class except a "salmon" box. No thank you. Was informed before take off by Captain that the plane was not serviced before we boarded in Phoenix. How does that happen? Need more frequent additions/turn over on the Entertainment. Thanks

Moved to earlier flight which unexpectedly had maintenance issues initially indicated as quick fix to ultimately plane changes. Moved back to original flight, also delayed. In all cases customer updates and communication very unclear, no updates on drivers for delays.

Flight was delayed. No urgency by American Airlines team to assist those with connecting flights. It was basically you are on your own to run through the terminals to try and make your connection. Thanks, Mary

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.

I understand that there is a catering issue - water should be the minimum stock. During the flight, not once that the attendants came through with water. The conversations in the kitchen were very loud and they were swearing. I do not expect any white glove service, at the minimum, we should be cordial. It was almost an inconveniece that we were on the flight. And it made us feel if you even dare question us, we'll make you deplane.

Beverage service was not good. Also just one service in 5 hr 30 min flight. No ask fir water ir anything beside one time beverage service.

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

Information on your arrival and departure airports