SEA

£661 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 9/5. 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.
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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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Flights Deals

Cheap Flight Deals 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.

Recent return flight deals from Belfast to Seattle

KAYAK's recommended return flight deals from the most popular airlines that fly from Belfast to Seattle.
Discover the best prices for you by selecting your travel dates on KAYAK.
KLM Logo
06:30 - 11:40BHD-SEA
13h 10m1 stop
KLM Logo
13:55 - 21:15SEA-BHD
23h 20m1 stop
£661KLM
Find Deal
Fri, 9 May - Fri, 30 May
KLM Logo
06:30 - 15:57BHD-SEA
17h 27m1 stop
KLM Logo
18:07 - 21:15SEA-BHD
19h 08m1 stop
£668KLM
Find Deal
Wed, 21 May - Fri, 30 May
KLM Logo
06:30 - 14:31BHD-SEA
16h 01m2 stops
KLM Logo
13:55 - 21:15SEA-BHD
23h 20m1 stop
£673KLM
Find Deal
Wed, 21 May - Fri, 30 May
Delta Logo
06:30 - 18:47BHD-SEA
20h 17m2 stops
Delta Logo
13:55 - 16:55SEA-BHD
19h 00m1 stop
£677Delta
Find Deal
Fri, 9 May - Fri, 30 May
KLM Logo
06:30 - 15:57BHD-SEA
17h 27m1 stop
KLM Logo
18:07 - 16:55SEA-BHD
14h 48m1 stop
£696KLM
Find Deal
Sat, 17 May - Sat, 24 May
Delta Logo
06:30 - 16:36BHD-SEA
18h 06m2 stops
Delta Logo
18:07 - 16:55SEA-BHD
14h 48m1 stop
£702Delta
Find Deal
Sat, 17 May - Sat, 24 May
Delta Logo
06:30 - 18:46BHD-SEA
20h 16m2 stops
Delta Logo
11:55 - 16:55SEA-BHD
21h 00m2 stops
£726Delta
Find Deal
Sat, 17 May - Sat, 24 May
 Logo
06:30 - 20:23BHD-SEA
21h 53m2 stops
 Logo
13:30 - 21:15SEA-BHD
23h 45m2 stops
Wed, 21 May - Fri, 30 May
British Airways Logo
11:55 - 23:09BHD-SEA
19h 14m2 stops
British Airways Logo
14:20 - 15:30SEA-BHD
17h 10m2 stops
£800British Airways
Find Deal
Fri, 9 May - Fri, 30 May
Useful Info

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 (£661) and Delta (£677).

Good to know - Cheap tickets from Belfast to Seattle

Cheapest flight

£661
Flight from Belfast City 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 £1,082 for a one-way ticket and £887 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?

    SkyTeam, and oneworld are the airline alliances operating flights between Belfast and Seattle, with SkyTeam being the most commonly used for this route.

  • 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.

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.
6.6
British AirwaysOverall score based on 6835 reviews
6.7Comfort
6.3Food
7.6Crew
6.4Entertainment
6.8Boarding
Airline reviews

Boarding is a mess. They never check group # so lots of people crowding in. Comfortable seats this flight. I had an empty seat next to me, very convenient. Food was really not good, but I was starved. The pizza snack thing was horrible. Crew was grand. They really make it enjoyable.

6.0 GoodLorrie, Apr 2025LHR - PDX
Read more British Airways reviews

Boarding is a mess. They never check group # so lots of people crowding in. Comfortable seats this flight. I had an empty seat next to me, very convenient. Food was really not good, but I was starved. The pizza snack thing was horrible. Crew was grand. They really make it enjoyable.

Crew very helpful and friendly. Food is so so. Main meal is not always the best. Did have a choice of a snack part way which was either a cookie, corn snack, or similar. Second kind of meal was basically like a pizza pastry that really wasn’t a favorite but probably a European snack? Screens and selections of movies, tv and such were good. No WI-Fi unless you buy so no free texting or such on the long flight but I think that might be any overseas flight.

Flight Attendant Karen Lynn was an absolute delight. She assisted in every portion of the services provided throughout the flight, aided with any and all concerns expressed by passengers, and even helped comfort an upset child who was one of five of a traveling family. This quality of service is what keeps me coming back to American. Thank you!

The worst, flight cancelled because the aircraft was not full. Heathrow ground crew totally not helpful and arrogant. Lady proposed us flight with 40min layover instead of direct and said it is our problem of course she was unable to do anything as everything was beyond her control she claimed. after calling on hotline another flight was booked. Flight was cancelled last second so we could not take direct from Zurich but we had to stay overnight in London.

Food was terrible , crew were excellent , IFE was dire . Overall comfortable seat and cabin. Nothing special .

If my tv wasn’t broken and I wasn’t in a seat that didn’t allow for sleeping

Delayed flight due to lack of crew caused me to miss my connection

Please make sure the number of seats matches the number of overhead bins and passengers don't carry on more than one bag.

Seating is tight if you don’t upgrade. Food was decent. Boarding and unboarding was efficient. Smooth flight. Could make upgrades more affordable

American Airlines seemed to run a 'dry' flight. No alcohol was offered at any point with meals. Breakfast was a bit tasteless. The 'hot pocket' whatever that is, was horrid breadish pastry with very little filling. Decaf coffee was horrid. Seats didn't seem as wide or spacious as usual, especually for a ten hour flight.

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

Information on your arrival and departure airports

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