SEA - BFS

$945 Find Cheap Flights from Seattle to Belfast Intl Airport

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 Intl departing on 7/2. 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 Belfast Intl Airport

 
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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Everything you should know

Cheapest round-trip
$1,211
Multiple Airlines
Thu 7/2Sun 8/2
SEA - BFS • 3 stops
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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 Intl!
Flight Deals
Useful Info
Flight Deals

Cheap Flights from Seattle to Belfast Intl (SEA-BFS)

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

Thu, Jul 2 - Sun, Aug 2
Multiple Airlines Logo
7:00 am - 7:30 pm
SEA
-
BFS
28h 30m
3 stops
Multiple Airlines Logo
6:45 am - 9:40 am
BFS
-
SEA
34h 55m
3 stops
$1,211Multiple Airlines
Mon, Jun 15 - Sun, Jun 21
Multiple Airlines Logo
12:35 pm - 11:20 pm
SEA
-
BFS
26h 45m
2 stops
Multiple Airlines Logo
7:00 am - 10:40 am
BFS
-
SEA
35h 40m
2 stops
$1,217Multiple Airlines
Fri, Jul 3 - Fri, Jul 10
Multiple Airlines Logo
5:45 am - 8:45 pm
SEA
-
BFS
31h 00m
3 stops
Multiple Airlines Logo
7:20 pm - 11:45 am
BFS
-
SEA
24h 25m
2 stops
$1,241Multiple Airlines
Thu, Jul 2 - Sun, Aug 2
Multiple Airlines Logo
7:10 pm - 7:30 pm
SEA
-
BFS
16h 20m
2 stops
Multiple Airlines Logo
6:45 am - 9:40 am
BFS
-
SEA
34h 55m
3 stops
$1,308Multiple Airlines
Mon, Jun 15 - Sun, Jun 21
Multiple Airlines Logo
5:45 am - 8:40 pm
SEA
-
BFS
30h 55m
3 stops
Multiple Airlines Logo
8:25 am - 9:40 am
BFS
-
SEA
33h 15m
3 stops
$1,309Multiple Airlines
Fri, Jul 3 - Fri, Jul 10
Multiple Airlines Logo
7:00 am - 4:30 pm
SEA
-
BFS
25h 30m
2 stops
Multiple Airlines Logo
10:10 pm - 5:10 pm
BFS
-
SEA
27h 00m
2 stops
$1,364Multiple Airlines
Fri, Jul 3 - Fri, Jul 10
Multiple Airlines Logo
5:45 am - 4:30 pm
SEA
-
BFS
26h 45m
3 stops
Multiple Airlines Logo
8:55 am - 9:40 am
BFS
-
SEA
32h 45m
3 stops
$1,369Multiple Airlines
Mon, Jun 15 - Sun, Jun 21
Multiple Airlines Logo
7:10 pm - 8:55 pm
SEA
-
BFS
17h 45m
2 stops
Multiple Airlines Logo
8:25 am - 9:40 am
BFS
-
SEA
33h 15m
3 stops
$1,465Multiple Airlines
Fri, Jul 3 - Fri, Jul 10
Multiple Airlines Logo
1:30 pm - 11:55 am
SEA
-
BFS
14h 25m
1 stop
Multiple Airlines Logo
10:15 pm - 9:40 am
BFS
-
SEA
43h 25m
2 stops
$1,473Multiple Airlines
Thu, Jul 2 - Sun, Aug 2
Multiple Airlines Logo
7:10 pm - 8:20 pm
SEA
-
BFS
17h 10m
2 stops
Multiple Airlines Logo
7:10 am - 5:55 pm
BFS
-
SEA
18h 45m
2 stops
$1,657Multiple Airlines
Useful Info

Good to know

Cheapest flight$1,211
Flight from Seattle to Belfast Intl Airport

When to book flights from Seattle to Belfast Intl

Are your dates flexible? Find out the best times to travel from Seattle to Belfast Intl 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 Seattle to Belfast Intl Airport flights

  • What is the cheapest flight from Seattle to Belfast Intl Airport?

    In the last 3 days, the lowest price for a flight from Seattle to Belfast Intl Airport was $945 for a round-trip ticket.

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

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

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

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

  • Which airline alliances offer flights from Seattle to Belfast Intl Airport?

    oneworld is the only airline alliance operating flights between Seattle and Belfast Intl Airport.

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

    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 Intl Airport.

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

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

    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 Intl Airport with an airline and back to Seattle with another airline. Booking your flights between Seattle and BFS can sometimes prove cheaper using this method.

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

    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 Intl Airport 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 Intl

 
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 Intl? 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 7989 reviews
6.8Comfort
6.4Entertainment
6.9Boarding
6.4Food
7.7Crew
Airline reviews

3.5 hr delay leaving Pittsburgh, notifications for which were incomplete and untimely. Connecting flight was automatically switched to one requiring more than a 30 hour layover! After waiting in a long queue, customer service reduced layover to 11 hours and also set up an earlier standby. The standby had empty seats, but the gate agent couldn't change our tickets! On top of all that my luggage was lost and has yet to even be located, much less returned 5 (FIVE!) days later. Too bad there's no rating below poor.

2.0 MediocreA&J, May 2026
PIT - LHR
Read more British Airways reviews

3.5 hr delay leaving Pittsburgh, notifications for which were incomplete and untimely. Connecting flight was automatically switched to one requiring more than a 30 hour layover! After waiting in a long queue, customer service reduced layover to 11 hours and also set up an earlier standby. The standby had empty seats, but the gate agent couldn't change our tickets! On top of all that my luggage was lost and has yet to even be located, much less returned 5 (FIVE!) days later. Too bad there's no rating below poor.

Canceled flight late London to Florence. Help at airport very poor. Treated poorly. Had to sleep in the airport. Lost bags- still do not have them. Horrible. I should be reimbursed!

The seats are extra cramped if you are taller than 5’8! Spring for the extra legroom seats for sure if you have a long flight!

Very disappointed with British Airways. It has been over 24 hours and I still have not received my checked baggage or any proper update. Customer support has been unresponsive, making the situation even more frustrating. Poor baggage handling and lack of communication seriously impacted my travel experience.

Flight was good but temp in the cabin was cold.

I like American Airlines and their safety record. They provide quality service and a feel safe enough to prefer American Airlines over other carriers even if I have to pay a little more.

Cancelled flight and re booked seats were a downgrade. British Airways said the upgrade was t available but when I checked it was but then they wouldn’t make it right

Boarding was orderly, pilot and flight attendants were nice, entertainment options were good, and low sodium meals were quite tasty.

The whole experience was excellent, O can say out from Miami the best airline to travel with for any European destination. Since the ground staff to the inflight crew attention was great, service on board 10 of 10. Finally the 380 is very confortable and nice to travel.

All crew except 1 were excellent. When I asked assistance with business class seat conversion to a bed (not being familiar as never used before but have numerous times with other airlines) crew member helped very reluctantly. I should have told her that business class seat conversion is totally different in each airline such as Delta, New Zealand Air and United. Sorry it was my 1st time with America Airlines. Now I know, I won't bother asking assistance in future.

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

Information on your arrival and departure airports

Seattle (SEA)
Belfast Intl (BFS)