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Belfast Intl

$370+ Cheap flights from Seattle (SEA) to Belfast Intl (BFS)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/16. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BFS
Aug 23 — Aug 301
Sun 8/23
Sun 8/30
1 adult, Economy
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Cheap flight deals from Seattle to Belfast Intl

Cheapest flights from Seattle to Belfast Intl
Explore the most affordable flight options available from Seattle to Belfast Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 24, 2026.

This Mytrip deal was found by Cheapflights users on 7/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/43:40 pm
SEA
-
BFS
3 stops23h 40m
Multiple Airlines
Fri 9/116:05 am
BFS
-
SEA
2 stops22h 35m
Multiple Airlines
Deal found 7/21$1,052
This Mytrip deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/185:50 am
SEA
-
BFS
3 stops25h 25m
Multiple Airlines
Mon 8/248:35 pm
BFS
-
SEA
3 stops45h 05m
Multiple Airlines
Deal found 7/20$1,061
This Mytrip deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/63:40 pm
SEA
-
BFS
2 stops21h 50m
Multiple Airlines
Sun 9/135:55 pm
BFS
-
SEA
2 stops26h 00m
Multiple Airlines
Deal found 7/23$1,139

Find flight deals from Seattle to Belfast Intl

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Belfast Intl (BFS). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 24, 2026.

Most accurate provider

Ovago
3 stars

Most trusted provider

Ovago
3 stars

Round-trip from

$1,052
(Mytrip)

One-way from

$370
(Trip.com)
Provider with most accurate pricing for Seattle/Tacoma Intl-Belfast Intl flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Belfast Intl flights.
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From Seattle/Tacoma Intl to Belfast Intl
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One-way flight from Seattle/Tacoma Intl to Belfast Intl
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Belfast Intl that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 24, 2026.
Use the filters below to find and compare flights from Seattle to Belfast Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Fri 9/4

3:40 pm-11:20 pm

3 stops23h 40m

Belfast Intl

Fri 9/11

6:05 am-8:40 pm

2 stops22h 35m

$1,052

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 8/18

7:00 pm-10:15 pm

2 stops19h 15m

Belfast Intl

Mon 8/24

9:50 pm-10:42 pm

3 stops32h 52m

$1,061

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 9/6

3:40 pm-9:30 pm

2 stops21h 50m

Belfast Intl

Sun 9/13

4:30 pm-5:55 pm

3 stops33h 25m

$1,171

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 9/5

7:00 pm-6:55 pm

2 stops15h 55m

Belfast Intl

Sat 9/12

9:30 am-9:40 am

3 stops32h 10m

$1,293
Cheapest one-way
Quickest one-way

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 11/16

2:35 pm-4:25 pm

2 stops17h 50m

$370

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/21

Sorted by cheapest first

Compare providers for flights from Seattle to Belfast Intl

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Belfast Intl in July.
ProviderPrice AccuracyTrust Score*
OvagoPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Belfast Intl Airport flights, users find the pricing of Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on Seattle-Belfast Intl Airport flight deals on Cheapflights vs. Ovago >95% of the time. Price accuracy is based on data collected from Seattle-Belfast Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Belfast Intl Airport flights, Cheapflights users trust Ovago the most. Ovago has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Belfast Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seattle to Belfast Intl

Have a flexible travel schedule? Discover the best time to fly to Belfast Intl from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Reviews of airlines servicing Belfast Intl

Get insights into the airlines that provide service to Belfast Intl. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Belfast Intl. Reviews last updated July 24, 2026.
Read through reviews of airlines operating flights from Seattle to Belfast Intl Airport, such as British Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
British Airways
6.7
Okay
8,129 reviews

Entertainment

6.5

Comfort

6.8

Crew

7.7

Overall

6.7

Food

6.4

Boarding

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

IAH - LHR

Airline was good the flight attendant were very helpful and kind. The problem I had is with cheap tickets, my ticket was not allowed one check in baggage this was new to me. I do a lot of traveling overseas and 1 check in baggage is always allowed. Also I bought insurance for my ticket it proved to be useless. I have called several times and spoke to your customer service, not one single person mentioned it to me that baggage was not allowed. All this additional expense was too much for me. I even asked one of your customer service representative I need to buy extra baggage should I buy it now and he told me when you receive check in information you can buy it @ that time never mentioned it to me that my ticket didn’t include baggage. It was very frustrating. I will never use cheap ticket again.
British Airways
6.7
Okay
8,129 reviews
British Airways
6.7
Okay
8,129 reviews

Entertainment

6.5

Comfort

6.8

Crew

7.7

Overall

6.7

Food

6.4

Boarding

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

IAH - LHR

Airline was good the flight attendant were very helpful and kind. The problem I had is with cheap tickets, my ticket was not allowed one check in baggage this was new to me. I do a lot of traveling overseas and 1 check in baggage is always allowed. Also I bought insurance for my ticket it proved to be useless. I have called several times and spoke to your customer service, not one single person mentioned it to me that baggage was not allowed. All this additional expense was too much for me. I even asked one of your customer service representative I need to buy extra baggage should I buy it now and he told me when you receive check in information you can buy it @ that time never mentioned it to me that my ticket didn’t include baggage. It was very frustrating. I will never use cheap ticket again.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Belfast Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Seattle to Belfast Intl?

    Located just 11.4 mi from the city center, Seattle/Tacoma Intl is the airport most travelers will use when flying to Belfast Intl from Seattle. Booking flights from Seattle/Tacoma Intl (SEA) to Belfast Intl should be relatively easy as there are 0 daily outbound flights to Belfast Intl from 1 airline.

  • What is the cheapest airline to fly from Seattle to Belfast Intl Airport round-trip?

    According to our current data, British Airways ($822), offers the cheapest pricing from Seattle to Belfast Intl Airport.

  • Can I find deals for flights from Seattle to Belfast Intl that include hotel bookings?

    Yes. In addition to deals on Seattle to Belfast Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Belfast Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Belfast Intl.

  • Can I find deals for business class flights from Seattle to Belfast Intl?

    Yes. Cheapflights offers flight deals from Seattle to Belfast Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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Other flights to Belfast Intl

Explore flights to Belfast Intl departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on July 24, 2026.
Belfast Intl Airport to Edinburgh flights
Belfast Intl Airport to Glasgow Intl Airport flights

Top airline flying from Seattle to Belfast Intl

Discover the top airline that operate flights from Seattle to Belfast Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 24, 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$822Average$1,091FlexibilityNo cancel feeOn-time70%

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