$612 Find Cheap Flights from Seattle to Belfast

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Belfast departing on 10/13. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Belfast

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Belfast, 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 Seattle to Belfast, as well as popular online travel agencies
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Flight Deals

Cheap Flights from Seattle to Belfast (SEA-BHD)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Belfast 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 round-trip flight deals from Seattle to Belfast

Mon, Oct 13 - Mon, Oct 20
Multiple Airlines Logo
3:45 pm - 5:30 pmSEA-BHD
17h 45m2 stops
Multiple Airlines Logo
6:40 am - 8:40 pmBHD-SEA
22h 00m2 stops
$612Multiple Airlines
Find Deal
Mon, Oct 13 - Mon, Oct 20
American Airlines Logo
8:20 pm - 8:45 pmSEA-BHD
16h 25m1 stop
American Airlines Logo
1:50 pm - 11:10 amBHD-SEA
29h 20m1 stop
$651American Airlines
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Mon, Oct 13 - Mon, Oct 20
Multiple Airlines Logo
4:53 pm - 5:30 pmSEA-BHD
16h 37m2 stops
Multiple Airlines Logo
1:50 pm - 11:10 amBHD-SEA
29h 20m1 stop
$656Multiple Airlines
Find Deal
Sat, Mar 7 - Wed, Mar 18
Finnair Logo
1:35 pm - 2:15 pmSEA-BHD
16h 40m1 stop
Finnair Logo
11:25 am - 5:55 pmBHD-SEA
13h 30m1 stop
$703Finnair
Find Deal
Sat, Mar 7 - Tue, Mar 17
Multiple Airlines Logo
1:35 pm - 2:15 pmSEA-BHD
16h 40m1 stop
Multiple Airlines Logo
11:25 am - 12:49 amBHD-SEA
20h 24m2 stops
$714Multiple Airlines
Find Deal
Sat, Mar 7 - Wed, Mar 18
British Airways Logo
6:50 pm - 4:45 pmSEA-BHD
13h 55m1 stop
British Airways Logo
11:25 am - 12:49 amBHD-SEA
20h 24m2 stops
$716British Airways
Find Deal
Sat, Mar 7 - Tue, Mar 17
British Airways Logo
1:34 pm - 2:15 pmSEA-BHD
16h 41m2 stops
British Airways Logo
6:35 am - 11:08 pmBHD-SEA
23h 33m2 stops
$722British Airways
Find Deal
Sat, Mar 7 - Tue, Mar 17
British Airways Logo
1:34 pm - 2:15 pmSEA-BHD
16h 41m2 stops
British Airways Logo
6:35 am - 11:08 pmBHD-SEA
23h 33m2 stops
$723British Airways
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Fri, Oct 3 - Fri, Oct 10
Delta Logo
5:40 pm - 9:15 pmSEA-BHD
19h 35m1 stop
Delta Logo
6:30 am - 4:05 pmBHD-SEA
17h 35m1 stop
$779Delta
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Fri, Oct 3 - Fri, Oct 10
Delta Logo
10:15 am - 4:55 pmSEA-BHD
22h 40m2 stops
Delta Logo
6:30 am - 4:05 pmBHD-SEA
17h 35m1 stop
$783Delta
Find Deal

Everything you should know

Top airlines
American Airlines
Cheapest • from $651 (round-trip)
British Airways
Best reviews • 6.7 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Cheapest round-trip
$612
Multiple Airlines
Mon 10/13Mon 10/20
SEA - BHD • 2 stops
Cheapest one-way
Multiple Airlines
Wed 9/17
SEA - BF1 • multi-stop
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Belfast!
Booking Insights

KAYAK's insights & trends for Seattle to Belfast flights

Get data-powered insights and trends into flights from Seattle to Belfast to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Seattle to Belfast?

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 round-trip tickets from Seattle to Belfast were found on American Airlines ($651) and Finnair ($703).

Find deals

Good to know

Cheapest flight$612
Flight from Seattle to Belfast City Airport

When to book flights from Seattle to Belfast

Are your dates flexible? Find out the best times to travel from Seattle to Belfast based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips 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 Seattle to Belfast

  • What is the cheapest flight from Seattle to Belfast?

    In the last 3 days, the lowest price for a flight from Seattle to Belfast was $612 for a round-trip ticket.

  • Do I need a passport to fly between Seattle and Belfast?

    Yes, you’ll need a passport to travel to Belfast from Seattle.

  • Which airports will I be using when flying from Seattle to Belfast?

    Seattle is served by only 1 airport and there are 2 airports in Belfast. You will leave Seattle from Seattle/Tacoma Intl and you will be arriving in Belfast at one of these airports: Belfast Intl or Belfast City.

  • Which aircraft models fly most regularly from Seattle to Belfast?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Seattle to Belfast?

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

  • How does KAYAK find such low prices on flights from Seattle to Belfast?

    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 Seattle to Belfast.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to Belfast?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Belfast from Seattle 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 Seattle to Belfast?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Belfast with an airline and back to Seattle with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to Belfast?

    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 Belfast from Seattle 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 Seattle to Belfast

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Belfast. 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 Seattle to Belfast? 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.
6.7
British AirwaysOverall score based on 7363 reviews
6.9Boarding
6.7Comfort
7.6Crew
6.4Entertainment
6.3Food
Airline reviews

The seating has become ridiculous… like a contest to see how narrow and short they can be made- forcing anyone over 5’1 to pay more to not be twisting oneself into a pretzel. Really insane- would have thought BA was better than this. Frankly- it cancels out a lot of the positive aspects.

4.0 OkayAnonymous, Sep 2025BOS - LHR
Read more British Airways reviews

The seating has become ridiculous… like a contest to see how narrow and short they can be made- forcing anyone over 5’1 to pay more to not be twisting oneself into a pretzel. Really insane- would have thought BA was better than this. Frankly- it cancels out a lot of the positive aspects.

flight was delayed from BWI to London - missed my connecting flight & then connecting flight (also British Air) was delayed - food is awful, TV & movie selection is great

Super tight economy class. My knees were hitting the back of seat in front of me (I'm only 5'6"). My small backpack (sized according to their required dimensions) would not fit under the seat in front of me because there is a box (is that the life jacket?) in the way. Over all, extremely uncomfortable. I forgive the tasteless food, but the tight seating was torture

Didn’t fly with them as someone had cancelled my flight

Online check-in 24 hours in advance something seems not so easy to check in to pick seats and to print a boarding pass

I like the crew, very welcoming. Food can be better. The seat arms don’t go up so. I could use the empty seat next to mine to relax better. 3hrs delay 😠

The flight was very delayed in taking off - which was out of control of the crew, but then the pilot worked hard so we only arrived about 30 minutes late. Everyone was very friendly and accommodating!

Boarding was efficient and quick, crew was very attentive, seats were comfortable.

Everything was very good! I personally struggled with the heat in the cabin for the first 2 hours

Very caring crew on board. Didn’t have dinner as I was sleeping. Was seating in the emergency row so I had comfortable leg room

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

Information on your arrival and departure airports

Seattle (SEA)

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