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Find cheap flights from Seattle to Belfast from $518

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 5/10. 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
0 bags
Sun 5/19
Sun 5/26

Search 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
In the last 7 days travelers have searched 44,553,814 times on KAYAK, and here is why:

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Cheap flight deals 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 and deals for you by selecting your travel dates.
Choose your dates
1:30 pm - 10:35 amSEA-BHD
13h 05m1 stop
12:45 pm - 5:45 pmBHD-SEA
13h 00m1 stop
$639British Airways
Find Deal
Tue, Oct 8 - Thu, Oct 17
11:33 am - 12:55 pmSEA-BHD
17h 22m2 stops
4:20 pm - 11:35 amBHD-SEA
27h 15m1 stop
$643American Airlines
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Tue, Oct 8 - Thu, Oct 17
7:05 pm - 2:50 pmSEA-BHD
35h 45m2 stops
3:35 pm - 8:08 pmBHD-SEA
36h 33m2 stops
$693Lufthansa
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Tue, Oct 8 - Thu, Oct 17
7:40 pm - 4:50 pmSEA-BHD
13h 10m1 stop
6:50 am - 11:35 amBHD-SEA
12h 45m1 stop
$822British Airways
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Sat, Sep 7 - Sat, Sep 21
11:33 am - 3:05 pmSEA-BHD
19h 32m2 stops
6:50 am - 11:35 amBHD-SEA
12h 45m1 stop
$826American Airlines
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Sat, Sep 7 - Sat, Sep 21
6:10 pm - 4:50 pmSEA-BHD
14h 40m1 stop
5:20 pm - 10:15 amBHD-SEA
24h 55m1 stop
$849Delta
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Sat, Aug 10 - Sat, Aug 24
6:10 pm - 4:50 pmSEA-BHD
14h 40m1 stop
5:20 pm - 5:00 pmBHD-SEA
31h 40m2 stops
$859Delta
Find Deal
Sat, Aug 10 - Sat, Aug 24
2:15 pm - 2:50 pmSEA-BHD
16h 35m1 stop
3:35 pm - 6:42 pmBHD-SEA
35h 07m2 stops
$3,374Lufthansa
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Thu, Jul 18 - Fri, Jul 26
7:40 pm - 5:40 pmSEA-BHD
14h 00m1 stop
6:35 am - 11:30 amBHD-SEA
12h 55m1 stop
$3,877
Find Deal
Wed, Jul 17 - Thu, Jul 25
10:40 am - 4:25 pmSEA-BHD
21h 45m3 stops
6:35 am - 9:58 pmBHD-SEA
23h 23m2 stops
$11,544
Find Deal
Wed, Jul 17 - Thu, Jul 25

Flights from Seattle to Belfast - Travel Insights & Trends

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 price for the route for each airline clicked by KAYAK users in the last 72 hours.
In the last 3 days, Delta offered the best one-way deal for that route, at $588. KAYAK users also found Seattle to Belfast round-trip flights on British Airways from $639 and on American Airlines from $643.

Good to know

Cheapest flight

$518
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 $518 for a one-way ticket and $639 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?

    SkyTeam, oneworld, and Star Alliance 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.

See more FAQs

Book cheap flights from Seattle to Belfast

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Seattle to Belfast found on KAYAK in the last 72 hours.
5/10Fri
3 stops
43h 05mSEA-BFS
$518
5/10Fri
3 stops
29h 45mSEA-BHD
$530
7/26Fri
2 stops
15h 35mSEA-BFS
$554
7/26Fri
1 stopDelta
14h 40mSEA-BHD
$588
7/26Fri
2 stopsDelta
15h 35mSEA-BHD
$592
5/10Fri
2 stops
29h 40mSEA-BFS
$644
5/10Fri
2 stops
30h 25mSEA-BHD
$648
5/10Fri
1 stopDelta
14h 40mSEA-BHD
$752
5/9Thu
2 stopsAmerican Airlines
35h 30mSEA-BHD
$1,129

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Seattle - Belfast Flights

Departure:

Seattle (SEA)United States

Return flight deals:

Belfast - Seattle

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