BFS - SEA

£603 Find Cheap Flights from Belfast Intl Airport 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 Intl to Seattle departing on 4/9. 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 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 Flights from Belfast Intl to Seattle (BFS-SEA)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Belfast Intl 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.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from Belfast Intl to Seattle

Thu, 4 Sep - Wed, 10 Sep
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06:35 - 20:40BFS-SEA
22h 05m2 stops
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19:00 - 23:10SEA-BFS
20h 10m2 stops
Fri, 12 Sep - Fri, 19 Sep
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08:30 - 17:50BFS-SEA
17h 20m2 stops
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19:00 - 21:10SEA-BFS
18h 10m2 stops
Thu, 4 Sep - Wed, 10 Sep
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06:35 - 10:15BFS-SEA
35h 40m2 stops
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17:35 - 20:30SEA-BFS
18h 55m1 stop
Fri, 12 Sep - Fri, 19 Sep
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06:05 - 22:16BFS-SEA
24h 11m3 stops
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15:45 - 22:35SEA-BFS
22h 50m3 stops
Fri, 12 Sep - Fri, 19 Sep
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08:25 - 20:40BFS-SEA
20h 15m2 stops
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15:45 - 22:35SEA-BFS
22h 50m3 stops
Sat, 16 Aug - Sun, 24 Aug
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09:40 - 20:40BFS-SEA
19h 00m2 stops
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16:00 - 23:00SEA-BFS
23h 00m2 stops
£1,136
Find Deal
Sat, 16 Aug - Sun, 24 Aug
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08:20 - 22:16BFS-SEA
21h 56m3 stops
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16:00 - 23:00SEA-BFS
23h 00m2 stops
£1,180
Find Deal
Useful Info

Good to know - Cheap tickets from Belfast Intl Airport to Seattle

Low seasonMay
Cheapest flight£603
Best time to beat the crowds (28% less expensive on average)
Most popular time to fly and prices are also 13% lower on average.
Flight from Belfast Intl Airport to Seattle

When to book flights from Belfast Intl to Seattle

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

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

    In the last 3 days, the lowest price for a flight from Belfast Intl Airport to Seattle was £803 for a return ticket.

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

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

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

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Belfast Intl Airport is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Belfast Intl Airport 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 Intl Airport with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Belfast Intl Airport 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 Intl Airport up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from Belfast Intl 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 Intl 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.
7.2
American AirlinesOverall score based on 10000 reviews
7.5Boarding
7.2Comfort
8.0Crew
6.5Food
6.9Entertainment
Airline reviews

Very poor delay in dfw was really bad n long

2.0 Mediocredavix, Jul 2025DFW - MKE
Read more American Airlines reviews

Very poor delay in dfw was really bad n long

Our flight was 1.5 hours delayed. There was no weather for the inbound flight, so I don't understand why. This meant a VERY late arrival and only a quick nap before my morning flight.

Because of rescheduling, they had to put me on a flight that didn't go through Dallas

It was very difficult to stretch my knee out and I am very short. I also had a torn tendon in my knee which made it extra uncomfortable anyways. My husband is 6'2" and I can't imagine him flying in that plane.

3 hour weather delay followed by 1 hour (and counting) maintenance delay. UGH!

Couldn’t get the door on the plane to close leading to a nearly 2 hour delay. But, hey at least they didn’t cancel the flight.

Very clean and comfortable cabin. Amazing Mediterranean salad for lunch before landing. Great range of films to watch. Really quiet and easy to sleep on the flight also. The initial food was a bit weird: odd fried chicken pieces in some weird white gloop, but that would be my lack of cultural knowledge on the grub. Salad more than made up for it at the other end. Staff were super attentive and helpful. Great and easy flight

International baggage recheck process in Philadelphia was a disaster. Waited 1 hour and 45 minutes to receive our bags. Waited 15 minutes to recheck bags, flight notification boards were blank so we asked an AA representative for our connecting gate and we were directed to the wrong terminal and gate. Our connection window was over 3 hours and we made our flight by 5 minutes. We pulled away from the gate and sat on the runway for 1 1/2 hours. 1 of our 4 bags didn’t make it to Phoenix. The mobile app for lost baggage didn’t work, the AA rep had to manually fix.

I miss my flight and they could not rebook me that day because the other flight was full, and for the next day I had to pay a whole new fee again which I think is unprofessional

Flight was cancelled 3 hrs AFTER etd. Thetefore Missed connection from JFK to New Zealand . No accommodation provided… This cost ne aporox 1000 USD in extra expenses and turned whst should have been a 24 hr trip ftom Boston - New Zealand into a VERY expensive , late 70+ hr nightmare … Complete nonsense!!!

Excellent everywhere but Philly, the most rotten airport in the world.

Check in was not the greatest as had to talk to an agent to clarify things and then he transferred us to another agent who had difficulty processing my credit card as there was a system glitch and not a card error.

I was put into business class. Wow! My flight attendant was great! The food amazing’

The gate at London Gatwick had confusing signs for the different zones and the staff seemed harried because people didn't know when it was their turn to come to the desk. Plus, with there were too many carry-on bag travelers, myself included. The charge scheme for checking bags is frustrating. If you travel light, you want the freedom to leave as soon as you deplane. When you are forced to gate-check your bag simply because the flight is fully booked, you lose whatever time you'd hoped to save because you're still stuck waiting for your bag to come off the conveyor belt.

Not so good with their baggage handling as they damaged one of my check in luggage

All went well on the flight, not happy of course with having to pay for a seat and in hold luggage of £50

We never made it onto this flight due to BA's lackluster organisation.

The air hostess were good, cheerful, but I didn't like the boarding. My son and I initially bought our flight tickets, making sure it included 1 luggage and a carry on. Tickets were purchased for British airlines, but we were merged with American Airlines. At checking in our languages, we were told, we don't have luggage prepaid so we had to pay extra $125 each and almost £60 on our way back. I think that's unfair.

Economy seats are so small and compacted so close together that comfort is negatively affected, especially on long flights. However that is due to aircraft design, not anything the airline can do about it.

3/4 bags delayed and 1/4 damaged at the other end. Flight was freezing

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

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