$389 Find Cheap Flights from Seattle to Belfast

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Belfast departing on 8/16. 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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Flights 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

dom., sep. 14 - lun., sep. 29
Logo
7:00 pm - 10:25 pmSEA-BFS
19h 25m2 stops
Logo
6:45 am - 8:40 pmBFS-SEA
21h 55m2 stops
$564
Find Deal
dom., sep. 14 - lun., sep. 29
Logo
7:00 pm - 8:25 pmSEA-BHD
17h 25m2 stops
Logo
7:05 am - 8:40 pmBHD-SEA
21h 35m2 stops
$657
Find Deal
mié., sep. 10 - lun., sep. 15
British Airways Logo
3:00 pm - 3:35 pmSEA-BHD
16h 35m2 stops
British Airways Logo
7:30 pm - 11:10 amBHD-SEA
23h 40m1 stop
$743British Airways
Find Deal
mié., sep. 10 - lun., sep. 15
British Airways Logo
3:00 pm - 6:40 pmSEA-BHD
19h 40m2 stops
British Airways Logo
6:30 pm - 5:29 pmBHD-SEA
30h 59m2 stops
$746British Airways
Find Deal
mié., oct. 29 - mié., nov. 5
British Airways Logo
7:50 pm - 4:35 pmSEA-BHD
13h 45m1 stop
British Airways Logo
7:25 pm - 4:55 pmBHD-SEA
29h 30m1 stop
$749British Airways
Find Deal
dom., sep. 14 - lun., sep. 29
KLM Logo
5:40 pm - 4:55 pmSEA-BHD
15h 15m1 stop
KLM Logo
5:25 pm - 4:06 pmBHD-SEA
30h 41m2 stops
$828KLM
Find Deal
dom., sep. 14 - lun., sep. 29
Delta Logo
9:40 am - 4:55 pmSEA-BHD
23h 15m2 stops
Delta Logo
6:30 am - 4:06 pmBHD-SEA
17h 36m2 stops
$890Delta
Find Deal
mar., dic. 23 - lun., ene. 12
Delta Logo
3:00 pm - 4:50 pmSEA-BHD
17h 50m1 stop
Delta Logo
5:20 pm - 11:50 amBHD-SEA
26h 30m1 stop
$914Delta
Find Deal
dom., ago. 24 - jue., sep. 4
KLM Logo
5:40 pm - 9:15 pmSEA-BHD
19h 35m1 stop
KLM Logo
6:40 am - 4:05 pmBHD-SEA
17h 25m1 stop
$954KLM
Find Deal
mar., dic. 2 - dom., dic. 7
American Airlines Logo
1:23 am - 2:15 pmSEA-BHD
28h 52m2 stops
American Airlines Logo
6:30 am - 6:20 pmBHD-SEA
19h 50m2 stops
$985American Airlines
Find Deal
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 British Airways ($743) and KLM ($828).

Find deals

Good to know

Cheapest flight$389
Flight from Seattle to Belfast Intl 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 $389 for a one-way ticket and $564 for a round-trip.

  • 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 SkyTeam 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.
6.6
British AirwaysOverall score based on 7222 reviews
6.7Comfort
7.6Crew
6.3Food
6.9Boarding
6.4Entertainment
Airline reviews

Flight was delayed. Though I checked in with BA live chat three times, our special meals were not provided.

4.0 OkayAnonymous, Jul 2025DEN - LHR
Read more British Airways reviews

Flight was delayed. Though I checked in with BA live chat three times, our special meals were not provided.

My experience with British Airways is excellent, thanks for all 🫶🏻✈️

Old tired plane, Uncomfortable business class seat. Breakfast dreadful and meagre. At least flight was on time!

The crew is very friendly and helpful. The food is good for airplane food. The flight is long and hard to sleep. The leg space is great. The plane arrived in plenty of time.

Enjoyable flight, helpful crew everything was organized to accommodate passengers.

Captain sick. Unable to get replacement so delayed me 30 hours, many others delayed 54 hours. TOTALLY DESTROYED ALL MY PLANS, including lost my rental car which would now cost over 5 times what I paid so stuck with buses n trains... lost hotel reservations.... HORRIBLE!!!

They’ve lost my bag and I have no way of really getting in touch with anyone and have received no updates.

Very crowded, no real explanation of food "chicken or pasta?" After dinner no drinks service. Plane was clean, but little help with finding soaces fir luggage to get into overhead bins. Many passengers putting 2 bags, hats, duty free in overhead bins so no space for roll ons

Flight was good but seat in 12D was not comfortable, better on the Airbus 321 from Tampa to Charlotte. No breakfast was served before landing in zLonfon only a coffee and orange juice.

I was transferred to an American Airlines flight. The boarding was late and unorganized. The seating was extremely tight and uncomfortable. Will not use AA again.

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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