SEA - BFS

$314 Find Cheap Flights from Seattle to Belfast Intl Airport

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 Intl departing on 7/4. 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

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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Flights Deals

Cheap Flight Deals 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.

Recent round-trip flight deals from Seattle to Belfast Intl

KAYAK's recommended round-trip deals from the most popular airlines that fly from Seattle to Belfast Intl.
Discover the best prices for you by selecting your travel dates on KAYAK.
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3:45 pm - 3:00 pmSEA-BFS
15h 15m2 stops
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9:00 am - 5:50 pmBFS-SEA
16h 50m2 stops
Tue, Jun 10 - Tue, Jun 17
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7:05 am - 6:35 pmSEA-BFS
27h 30m2 stops
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5:05 pm - 10:16 pmBFS-SEA
37h 11m3 stops
Wed, Jun 11 - Wed, Jun 18
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3:45 pm - 3:00 pmSEA-BFS
15h 15m2 stops
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9:00 am - 8:40 pmBFS-SEA
19h 40m2 stops
Tue, Jun 10 - Tue, Jun 17
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7:05 am - 6:35 pmSEA-BFS
27h 30m2 stops
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5:05 pm - 8:28 pmBFS-SEA
35h 23m2 stops
Wed, Jun 11 - Wed, Jun 18
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10:00 am - 6:35 pmSEA-BFS
24h 35m3 stops
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5:05 pm - 10:16 pmBFS-SEA
37h 11m3 stops
Wed, Jun 11 - Wed, Jun 18
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10:00 am - 4:40 pmSEA-BFS
22h 40m3 stops
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6:15 am - 8:37 pmBFS-SEA
22h 22m3 stops
Tue, Jun 10 - Tue, Jun 17
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6:50 pm - 9:00 pmSEA-BFS
18h 10m2 stops
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7:35 am - 4:59 pmBFS-SEA
17h 24m2 stops
Fri, Jun 13 - Fri, Jun 20
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10:00 am - 10:30 pmSEA-BFS
28h 30m3 stops
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6:00 am - 9:21 amBFS-SEA
35h 21m3 stops
Mon, Jun 16 - Thu, Jun 19
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10:00 am - 6:35 pmSEA-BFS
24h 35m3 stops
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5:05 pm - 8:28 pmBFS-SEA
35h 23m2 stops
Wed, Jun 11 - Wed, Jun 18
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7:05 am - 4:40 pmSEA-BFS
25h 35m3 stops
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6:15 am - 8:37 pmBFS-SEA
22h 22m3 stops
Tue, Jun 10 - Tue, Jun 17
Useful Info

Good to know

Low seasonOctober
High seasonJuly
Cheapest flight$314
Best time to beat the crowds with an average 40% drop in price.
Most popular time to fly with an average 21% increase in price.
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 $314 for a one-way ticket and $788 for a round-trip.

  • 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.

  • 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.

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.
6.6
British AirwaysOverall score based on 6845 reviews
6.3Food
7.6Crew
6.4Entertainment
6.8Boarding
6.7Comfort
Airline reviews

The flight from Seattle was delayed, which made me miss my connection to Florence. I was re-booked NINE HOURS LATER!!! That’s basically a vacation day lost. British Airways needs to partner with other airlines when possible to get a more realistic travel time, if delays occur. I realize there aren’t many flights to Florence from London, so I would book differently were I to return. The actual flight from Seattle was very comfortable and the crew was great, no faults there. I enjoy British Airways, this was an anomaly.

6.0 GoodAnonymous, Apr 2025SEA - LHR
Read more British Airways reviews

The flight from Seattle was delayed, which made me miss my connection to Florence. I was re-booked NINE HOURS LATER!!! That’s basically a vacation day lost. British Airways needs to partner with other airlines when possible to get a more realistic travel time, if delays occur. I realize there aren’t many flights to Florence from London, so I would book differently were I to return. The actual flight from Seattle was very comfortable and the crew was great, no faults there. I enjoy British Airways, this was an anomaly.

The crew could not have been more helpful, my meal was excellent, I slept peacefully until right before landing, and the BA lounge was a godsend. The only negative I encountered was the coffee both on the plane and in the lounge. Not to my taste but that’s a personal preference.

I don’t understand why a reputable airline like BA would delegate their London flights to AA. Makes no sense to me, as most domestic carriers do such a poor job these days. Terminal 3 at LHR is a total dump

Cancelled flight minutes before boarding. Rescheduled flight was two days later

The flight attendants were EXTREMELY personable and appreciated the service, lights going off after dinner (probably the norm, but I haven’t flown evening overnight flights in a while). Thank you!

Business class seats were very dated on my plane. Very little storage, charging ports were not easily accessible, tv screen kept flopping away. Vegetarian food was disappointing: hardly any protein and severely under-seasoned. Crew was lovely.

The food was ok, but not great. They delayed boarding in Portland and did not enforce group boarding. But the crew was excellent, went above and beyond.

The food was pathetic. There wasn't much leg room and recline space for such a long flight. No tea/ coffee for a 2-3 hour connecting flight without purchasing! Really!?

Service was very good. Because I use a cane, I was allowed to use Priority Boarding. Biggest problem was extremely limited leg room in Economy class seats. For airplane food, it was alright.

Was late but that airport/storm fault. Flight was full but comfortable. Food quite nice. Unfortunate that I had a rather miserable attendant, others were much friendlier

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

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