SEA

£629 Find Cheap Flights from Belfast 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 to Seattle departing on 28/1. 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 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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Everything you should know

Cheapest return fare
£629
British Airways
Wed 28/1Sun 1/2
BHD - SEA • 1 stop
Cheapest one-way flight
Multiple Airlines
Tue 16/12
BF1 - SEA • multi-stop
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Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Belfast to Seattle

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

Wed, 28 Jan - Sun, 1 Feb
British Airways Logo
12:25 - 16:55
BHD
-
SEA
12h 30m1 stop
British Airways Logo
14:04 - 14:15
SEA
-
BHD
40h 11m2 stops
£629British Airways
Wed, 28 Jan - Sun, 1 Feb
British Airways Logo
06:35 - 22:07
BHD
-
SEA
23h 32m2 stops
British Airways Logo
14:04 - 14:15
SEA
-
BHD
40h 11m2 stops
£633British Airways
Wed, 4 Feb - Sun, 8 Feb
British Airways Logo
06:35 - 16:55
BHD
-
SEA
18h 20m1 stop
British Airways Logo
18:50 - 18:40
SEA
-
BHD
15h 50m1 stop
£655British Airways
Wed, 28 Jan - Sun, 1 Feb
British Airways Logo
12:25 - 16:55
BHD
-
SEA
12h 30m1 stop
British Airways Logo
18:50 - 07:40
SEA
-
BHD
28h 50m1 stop
£662British Airways
Wed, 4 Feb - Sun, 8 Feb
British Airways Logo
06:35 - 22:07
BHD
-
SEA
23h 32m2 stops
British Airways Logo
08:04 - 10:20
SEA
-
BHD
18h 16m2 stops
£663British Airways
Fri, 30 Jan - Fri, 6 Feb
Multiple Airlines Logo
08:05 - 17:00
BFS
-
SEA
16h 55m2 stops
Multiple Airlines Logo
14:35 - 15:10
SEA
-
BFS
16h 35m2 stops
£681Multiple Airlines
Fri, 30 Jan - Fri, 6 Feb
Multiple Airlines Logo
18:00 - 17:00
BFS
-
SEA
31h 00m3 stops
Multiple Airlines Logo
14:35 - 13:05
SEA
-
BFS
14h 30m2 stops
£770Multiple Airlines
Fri, 27 Mar - Fri, 10 Apr
Aer Lingus Logo
06:50 - 19:20
BHD
-
SEA
19h 30m2 stops
Aer Lingus Logo
18:45 - 21:00
SEA
-
BHD
18h 15m2 stops
£1,021Aer Lingus
Fri, 27 Mar - Fri, 10 Apr
Delta Logo
06:30 - 12:35
BHD
-
SEA
13h 05m1 stop
Delta Logo
11:47 - 16:55
SEA
-
BHD
21h 08m2 stops
£1,095Delta
Fri, 27 Mar - Fri, 10 Apr
Finnair Logo
06:45 - 12:30
BHD
-
SEA
12h 45m1 stop
Finnair Logo
13:35 - 18:15
SEA
-
BHD
20h 40m1 stop
£1,110Finnair
Booking Insights

KAYAK's insights & trends for Belfast to Seattle flights

Get data-powered insights and trends into flights from Belfast to Seattle to help you find the cheapest flights, the best time to fly and much more.

Which airlines fly direct between Belfast and Seattle?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for round-trip flights from Belfast to Seattle.

There are 2 airlines that fly direct from Belfast to Seattle. They are American Airlines and British Airways. The cheapest airline for this route is British Airways, with the best return deal found costing £439. On average, the best prices for this route can be found at British Airways.

Good to know - Cheap tickets from Belfast to Seattle

Cheapest flight£629
Flight from Belfast City Airport to Seattle

When to book flights from Belfast to Seattle

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

  • What is the cheapest flight from Belfast to Seattle?

    In the last 3 days, the lowest price for a flight from Belfast to Seattle was £629 for a return ticket.

  • Which airports will I be using when flying from Belfast to Seattle?

    There are 2 airports in Belfast (Belfast Intl and Belfast City.) and only 1 airport in Seattle (Seattle/Tacoma Intl). The cheapest flights are generally found on the Belfast City Airport to Seattle/Tacoma Intl flight route.

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

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

  • Which airline alliances offer flights from Belfast to Seattle?

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

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

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Belfast 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 Belfast 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 with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Belfast 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 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 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 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 11047 reviews
6.5Food
6.9Entertainment
7.5Boarding
7.2Comfort
8.0Crew
Airline reviews

Gate was overcrowded. Gate agents performed very well. Flight crew was top notch! Efficient & professional & courteous. Both meals not thermalized well. Dinner main dish was actually cold in the center. Almost inedible. Breakfast sandwich was lukewarm.

8.0 ExcellentAnonymous, Dec 2025
BNA - JFK
Read more American Airlines reviews

Gate was overcrowded. Gate agents performed very well. Flight crew was top notch! Efficient & professional & courteous. Both meals not thermalized well. Dinner main dish was actually cold in the center. Almost inedible. Breakfast sandwich was lukewarm.

The boarding was as always, the crew tried their best but not enough. The food was a disaster I had dietary restrictions that were half met because the company did not loaded the food for the flight. The entertainment screen was fine but content was not and also they removed the free messaging option from the flight and they charged 30 dollars for that crappy bandwidth. This flight is not worth the cost and the company is going down on quality.

Awful. They won’t help me with anything. I booked on American but they abdicated to Iberia. The ticket was overpriced. Everything negative

it was fine, decent flight... dont get food besides cookies or pretzels so not sure why you ask about food. same for entertainment..

I got sick nothing contagious but distressing and the care I received by Kayla? Keighly the flight attendant will be memorable for ever. Thank You

I got sick nothing contagious but distressing enough and the care I received on the flight was astounding.

Waaay too small plane. They also need to up the size of the overhead bins. I would love to keep me 3k with of camera equipment in my hard case baggahe instead of it being thrown into the belly of the plane

Attendants were pleasant and the flight was smooth and relaxed.

A little late at the start but all worked out well.

It was fine. No drinks nor snacks offered though. I thought that was unusual.

I was in a bulkhead seat and my tray table wasn't level. Eating was difficult.

Audi visual not working for a whole group of seats in first class. How does a plane leave the main hub in such poor condition? How much that we can’t see so immediately is also compromised?

main meals are horrible but then you dont fly for the food

It was good. Couldn’t Check in online and select seats

It was great. Enough space and room for legs . Great service to.

⭐ British Airways Review — A Journey of Highs, Lows, and Lessons ⭐ I recently flew Business Class round-trip from Boston to Mumbai with British Airways, and my experience was a tale of two extremes — from disappointment to exceptional service, and then back to inconsistency. Boston → London: A Surprisingly Poor Start My journey began on a disappointing note. On a 6-hour Business Class flight, I was surprised to discover that there wasn’t a single proper vegetarian meal option available. I was offered a few bakery items only after repeatedly requesting something to eat. The flight attendant shrugged, offered no solution, and eventually — quite literally — threw some bread at me after much delay. This was not only disheartening, it was extremely surprising given my wonderful Business Class experience with BA last year. I stepped off that flight genuinely hungry and had to make a mad dash to the lounge just to get a proper meal. London → Mumbai: A Complete Turnaround The next sector restored my faith in British Airways. The entire crew was warm, welcoming, attentive, and genuinely caring. A special shoutout to Phiroze and the entire team serving the Business Class cabin — their professionalism, hospitality, and thoughtful service were extraordinary. They truly embodied what makes British Airways a global leader, and I am deeply grateful for the experience they provided. This is the BA I know and love. Mumbai → London: A Strange Meal Schedule This sector was generally fine, but the meal timing was puzzling. Lunch at 10:30 AM — for a Business cabin — felt unusual, and most passengers, including myself, barely touched it. The rest of the service was smooth, but the scheduling definitely needs a rethink. London → Boston: Mixed Experience Again The flight itself was decent, but the Business Lounge at Heathrow for this leg was a letdown. Arrived during lunch hours: no hot vegetarian options available Lounge area: dirty dishes everywhere Even after politely alerting the staff, the dishes were ignored and left uncleared For a premium cabin passenger — and at one of the world’s busiest international hubs — this was disappointing. Overall Impression My journey with British Airways felt inconsistent — two great sectors sandwiched between two that fell short of the BA standard. When BA is good, it is world-class. When it misses, the gap is noticeable. I genuinely hope the airline takes this feedback as constructive insight. I continue to believe in British Airways, and I commend the outstanding crew on the London → Mumbai sector — they were the highlight of my entire trip. With a little more focus on vegetarian meal availability, lounge service, and consistency across crews, BA can ensure every Business Class passenger experiences the premium journey they promise.

We were in business class and I had seat # 1. This was a night flight and after dinner was served, lights were dimmed and I went to sleep. The crew were loud and noisy so I didn’t get much sleep. I expect the crew to enjoy themselves but would Appreciate some decency in staying quiet while the passengers sleep

Have travelled business class with other airlines who profess to be the best in the world. They can however not beat the service and comfort that BA provide.

Great on board entertainment Tasty food Cattle class obviously crammed but not as bad as shorter hall flights

Logan gate staff was unhelpful. Arrived early, come to find out the airbus scheduled was reassigned and I did not have a seat. The desk agent spoke to his supervisor who instructed him to give me a boarding pass to get up to gate area, he was polite. At the gate the fellow was sitting to the side with two other BA staff . I asked him if he could help me, his answer was” we are on a break, we are closed” then turned his back. I am almost 70, drove 4 1/2 hours to Boston and had been looking forward to this trip for 5 months. I have worked in service many times in my life and this is not how it is done. I eventually (1/2 hr) before boarding was able to get a seat. The rest of the flight experience was unremarkable.

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

Information on your arrival and departure airports