$867+ Cheap flights from Seattle (SEA) to Belfast Intl (BFS)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/7. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BFS
Nov 25 — Dec 21
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Seattle to Belfast Intl with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Seattle to Belfast Intl
Cheapest
Best
Last-minute
Cheapest flights from Seattle to Belfast IntlExplore 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 October 26, 2026.
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 October 26, 2026.
This Mytrip deal was found by Cheapflights users on 10/23. 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.
Mon 12/72:35 pm -
3 stops22h 40m
Mon 12/142:35 pm -
3 stops34h 25m
Deal found 10/23![Multiple Airlines logo]()
$867
This Kiwi.com deal was found by Cheapflights users on 10/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/102:35 pm -
2 stops23h 05m
Tue 11/175:05 pm -
1 stop31h 55m
Deal found 10/22![Multiple Airlines logo]()
$933
This Mytrip deal was found by Cheapflights users on 10/22. 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 12/63:00 pm -
2 stops21h 10m
Sun 12/135:10 pm -
2 stops30h 45m
Deal found 10/22![Multiple Airlines logo]()
$967
This Trip.com deal was found by Cheapflights users on 10/25. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/266:50 pm -
2 stops19h 25m
Mon 11/26:20 am -
2 stops41h 35m
Deal found 10/25![Multiple Airlines logo]()
$1,325
Best flights from Seattle to Belfast IntlDiscover carefully curated flight deals from Seattle to Belfast Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 26, 2026.
Discover carefully curated flight deals from Seattle to Belfast Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 26, 2026.
This Kiwi.com deal was found by Cheapflights users on 10/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/102:35 pm -
2 stops23h 05m
Tue 11/175:05 pm -
1 stop31h 55m
Deal found 10/22![Multiple Airlines logo]()
$933
This Mytrip deal was found by Cheapflights users on 10/22. 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.
Sat 4/107:00 pm -
2 stops15h 30m
Sat 4/246:20 am -
3 stops19h 35m
Deal found 10/22![Multiple Airlines logo]()
$1,047
This Mytrip deal was found by Cheapflights users on 10/22. 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 12/62:35 pm -
3 stops22h 45m
Sun 12/138:40 pm -
3 stops28h 20m
Deal found 10/22![Multiple Airlines logo]()
$1,068
This Mytrip deal was found by Cheapflights users on 10/23. 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.
Mon 12/75:50 pm -
2 stops18h 20m
Mon 12/146:10 am -
2 stops17h 45m
Deal found 10/23![Multiple Airlines logo]()
$1,070
Last-minute flights from Seattle to Belfast IntlDiscover last-minute flight deals from Seattle to Belfast Intl. Data last updated October 26, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Belfast Intl. Data last updated October 26, 2026 and is based on user searches.
This Trip.com deal was found by Cheapflights users on 10/25. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/266:50 pm -
2 stops19h 25m
Mon 11/26:20 am -
2 stops41h 35m
Deal found 10/25![Multiple Airlines logo]()
$1,325
This Kiwi.com deal was found by Cheapflights users on 10/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/102:35 pm -
2 stops23h 05m
Tue 11/175:05 pm -
1 stop31h 55m
Deal found 10/22![Multiple Airlines logo]()
$933
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 October 26, 2026.
Most accurate provider | Ovago 3 stars |
|---|---|
Most trusted provider | Ovago 3 stars |
Round-trip from | $867 (Mytrip) |
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 7,457,451 searches. Data last updated October 26, 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
Cheapest round-trip
SeattleBelfast
SEA Seattle/Tacoma Intl - BFS Belfast Intl
SEABFS
Seattle/Tacoma Intl
Tue 11/10
2:35 pm-9:40 pm
2 stops23h 05m
Belfast Intl
Tue 11/17
5:05 pm-5:00 pm
1 stop31h 55m
$933
Quickest round-trip
SeattleBelfast
SEA Seattle/Tacoma Intl - BFS Belfast Intl
SEABFS
Seattle/Tacoma Intl
Sat 4/10
7:00 pm-6:30 pm
2 stops15h 30m
Belfast Intl
Sat 4/24
6:20 am-5:55 pm
3 stops19h 35m
$1,047
SeattleBelfast
SEA Seattle/Tacoma Intl - BFS Belfast Intl
SEABFS
Seattle/Tacoma Intl
Sun 12/6
2:35 pm-9:20 pm
3 stops22h 45m
Belfast Intl
Sun 12/13
8:40 pm-5:00 pm
3 stops28h 20m
$1,068
SeattleBelfast
SEA Seattle/Tacoma Intl - BFS Belfast Intl
SEABFS
Seattle/Tacoma Intl
Mon 12/7
5:50 pm-8:10 pm
2 stops18h 20m
Belfast Intl
Mon 12/14
6:10 am-3:55 pm
2 stops17h 45m
$1,070
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 October.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- 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.
SEA-BFS
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 October 26, 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.
Comfort
6.8
Food
6.4
Boarding
7.0
Entertainment
6.5
Overall
6.7
Crew
7.7
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
IAH - LHR
Comfort
6.8
Food
6.4
Boarding
7.0
Entertainment
6.5
Overall
6.7
Crew
7.7
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
IAH - LHR
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.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Belfast Intl flight routes
Complete your trip
Flights by cabin class
Other flight options
Other flights from Seattle
Popular flights
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 October 26, 2026.
Complete your trip
Complete your trip to Belfast Intl by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Seattle to Belfast Intl by cabin class
Find flights from Seattle to Belfast Intl, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Seattle and Belfast Intl flights
Browse other Seattle and Belfast Intl flight options. Last updated on October 26, 2026.
Other flights from Seattle
Browse through other flights departing from Seattle. Flights are based on user searches made on Cheapflights and were last updated on October 26, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
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 7,457,451 searches. Data last updated October 26, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$804 | Average$1,113 | FlexibilityNo cancel fee | On-time70% |