SEA

£381 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 15/7. 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
£652
Multiple Airlines
Mon 15/6Mon 22/6
BFS - SEA • 2 stops
Cheapest one-way flight
£381
Multiple Airlines
Wed 15/7
BFS - SEA • 3 stops
Top airlines
Cheapest • from £757 (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

Mon, 15 Jun - Mon, 22 Jun
Multiple Airlines Logo
07:00 - 20:40
BFS
-
SEA
21h 40m
2 stops
Multiple Airlines Logo
19:00 - 23:10
SEA
-
BFS
20h 10m
2 stops
£652Multiple Airlines
Mon, 15 Jun - Mon, 22 Jun
Multiple Airlines Logo
07:00 - 18:45
BFS
-
SEA
19h 45m
1 stop
Multiple Airlines Logo
21:45 - 23:10
SEA
-
BFS
17h 25m
1 stop
£733Multiple Airlines
Mon, 29 Jun - Mon, 6 Jul
Multiple Airlines Logo
06:30 - 18:45
BFS
-
SEA
44h 15m
3 stops
Multiple Airlines Logo
15:40 - 22:15
SEA
-
BFS
22h 35m
3 stops
£749Multiple Airlines
Wed, 4 Nov - Sun, 8 Nov
British Airways Logo
11:25 - 16:55
BHD
-
SEA
13h 30m
1 stop
British Airways Logo
11:42 - 10:40
SEA
-
BHD
38h 58m
2 stops
£757British Airways
Wed, 4 Nov - Sun, 8 Nov
British Airways Logo
09:15 - 16:55
BHD
-
SEA
15h 40m
1 stop
British Airways Logo
14:46 - 10:40
SEA
-
BHD
35h 54m
2 stops
£760British Airways
Wed, 24 Jun - Sun, 5 Jul
Multiple Airlines Logo
06:10 - 20:40
BFS
-
SEA
22h 30m
2 stops
Multiple Airlines Logo
19:00 - 20:15
SEA
-
BFS
17h 15m
2 stops
£760Multiple Airlines
Mon, 15 Jun - Mon, 22 Jun
Multiple Airlines Logo
08:00 - 18:30
BFS
-
SEA
18h 30m
3 stops
Multiple Airlines Logo
13:30 - 23:20
SEA
-
BFS
25h 50m
3 stops
£762Multiple Airlines
Mon, 15 Jun - Mon, 22 Jun
Multiple Airlines Logo
06:30 - 21:00
BFS
-
SEA
22h 30m
2 stops
Multiple Airlines Logo
22:05 - 23:20
SEA
-
BFS
17h 15m
1 stop
£766Multiple Airlines
Wed, 7 Oct - Sun, 11 Oct
British Airways Logo
06:30 - 11:35
BHD
-
SEA
13h 05m
1 stop
British Airways Logo
20:20 - 18:45
SEA
-
BHD
14h 25m
1 stop
£784British Airways
Wed, 24 Jun - Sun, 5 Jul
KLM Logo
17:30 - 16:24
BHD
-
SEA
30h 54m
1 stop
KLM Logo
09:30 - 09:20
SEA
-
BHD
15h 50m
2 stops
£930KLM
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 British Airways (£757) and KLM (£930).

Good to know - Cheap tickets from Belfast to Seattle

Cheapest flight£381
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 £381 for a one-way ticket and £749 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 11662 reviews
6.9Entertainment
7.2Comfort
6.4Food
7.5Boarding
7.9Crew
Airline reviews

Fine. Nothing to write home about. The plane left on time, and arrived on time.

6.0 GoodRobert, May 2026
PHL - CLE
Read more American Airlines reviews

Fine. Nothing to write home about. The plane left on time, and arrived on time.

I was downgraded from first class to coach due to an airplane change. They pulled me out of line and I was the very last person to board the plane stuck in the middle seat with no overhead place to put my carry-.on. Very poor customer service.

Seat comfort was poor (no lumbar or lower back support).

The airplane seats were spacious and comfortable, and the flight attendants were friendly and attentive. The food was delicious like never before. The blankets and toiletries were thoughtfully provided. The captain's navigation was steady and reliable. In short, having flown with Starlux, I won't consider any other airline next time.

They lost my bag. ... And I asked them 3 times to 3 different people if my checked bag will maKe it all the way - they all confirmed and at the end it was left at the connection... Bravo

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.

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

Information on your arrival and departure airports