SEA

£387 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 25/8. 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
£709
Multiple Airlines
Wed 24/6Wed 1/7
BFS - SEA • 2 stops
Cheapest one-way flight
£387
Multiple Airlines
Tue 25/8
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

Wed, 24 Jun - Wed, 1 Jul
Multiple Airlines Logo
06:10 - 20:40
BFS
-
SEA
22h 30m
2 stops
Multiple Airlines Logo
15:40 - 19:40
SEA
-
BFS
20h 00m
2 stops
£709Multiple Airlines
Tue, 6 Oct - Tue, 20 Oct
British Airways Logo
09:40 - 18:25
BHD
-
SEA
16h 45m
1 stop
British Airways Logo
11:34 - 15:20
SEA
-
BHD
19h 46m
2 stops
£715British Airways
Tue, 6 Oct - Tue, 20 Oct
Multiple Airlines Logo
09:40 - 00:14
BHD
-
SEA
22h 34m
2 stops
Multiple Airlines Logo
11:34 - 15:20
SEA
-
BHD
19h 46m
2 stops
£719Multiple Airlines
Tue, 23 Jun - Tue, 30 Jun
Multiple Airlines Logo
06:15 - 15:40
BFS
-
SEA
17h 25m
2 stops
Multiple Airlines Logo
18:05 - 22:25
SEA
-
BFS
20h 20m
2 stops
£728Multiple Airlines
Wed, 4 Nov - Sun, 8 Nov
British Airways Logo
09:15 - 16:55
BHD
-
SEA
15h 40m
1 stop
British Airways Logo
11:42 - 10:40
SEA
-
BHD
38h 58m
2 stops
£748British Airways
Wed, 4 Nov - Sun, 8 Nov
British Airways Logo
06:35 - 16:55
BHD
-
SEA
18h 20m
1 stop
British Airways Logo
11:42 - 10:40
SEA
-
BHD
38h 58m
2 stops
£750British Airways
Thu, 10 Sep - Mon, 14 Sep
British Airways Logo
20:35 - 11:35
BHD
-
SEA
23h 00m
1 stop
British Airways Logo
06:24 - 12:55
SEA
-
BHD
22h 31m
2 stops
£773British Airways
Thu, 10 Sep - Mon, 14 Sep
British Airways Logo
09:35 - 18:25
BHD
-
SEA
16h 50m
1 stop
British Airways Logo
06:24 - 12:55
SEA
-
BHD
22h 31m
2 stops
£776British Airways
Thu, 10 Sep - Mon, 14 Sep
British Airways Logo
09:35 - 17:29
BHD
-
SEA
39h 54m
2 stops
British Airways Logo
06:24 - 12:55
SEA
-
BHD
22h 31m
2 stops
£778British Airways
Thu, 10 Sep - Mon, 14 Sep
British Airways Logo
09:35 - 17:29
BHD
-
SEA
39h 54m
2 stops
British Airways Logo
06:24 - 12:55
SEA
-
BHD
22h 31m
2 stops
£779British Airways
Useful Info

Good to know - Cheap tickets from Belfast to Seattle

Cheapest flight£387
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 £387 for a one-way ticket and £709 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 11667 reviews
7.2Comfort
7.9Crew
6.4Food
7.5Boarding
6.9Entertainment
Airline reviews

We had several flights and they were all on-time and flawless

10.0 ExcellentMaria-Jose, May 2026
MIA - AVL
Read more American Airlines reviews

We had several flights and they were all on-time and flawless

My Frequent Flyer nber wasn't put on as I was told it was..... This resulted in a last group boarding and no priority tags on My bags.

Terrible steward... Plane was quite empty... I asked to move "back" in the plane and the steward said no... Unnecessary power trip of mediocre people.

The small flights with Valet Luggage has a poor service

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

Seattle (SEA)