$855+ 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 9/21. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BFS
Oct 11 — Oct 181
Round-trip
1 adult, Economy
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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 September 11, 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 September 11, 2026.
This Mytrip deal was found by Cheapflights users on 9/10. 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 9/217:10 pm -
2 stops19h 55m
Tue 10/65:55 am -
2 stops19h 15m
Deal found 9/10![Multiple Airlines logo]()
$855
This Mytrip deal was found by Cheapflights users on 9/9. 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.
Wed 12/92:35 pm -
2 stops23h 45m
Mon 12/148:40 am -
3 stops32h 52m
Deal found 9/9![Multiple Airlines logo]()
$984
This Mytrip deal was found by Cheapflights users on 9/8. 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 10/93:40 pm -
2 stops21h 20m
Thu 10/156:10 am -
2 stops22h 30m
Deal found 9/8![Multiple Airlines logo]()
$1,043
This Mytrip deal was found by Cheapflights users on 9/11. 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 10/113:55 pm -
3 stops22h 40m
Sun 10/189:55 am -
2 stops18h 45m
Deal found 9/11![Multiple Airlines logo]()
$1,067
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 September 11, 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 September 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/10. 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.
Mon 9/219:55 am -
2 stops40h 45m
Tue 10/68:15 pm -
1 stop30h 45m
Deal found 9/10![Multiple Airlines logo]()
$1,008
This Mytrip deal was found by Cheapflights users on 9/8. 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 10/93:40 pm -
2 stops21h 20m
Thu 10/156:10 am -
2 stops22h 30m
Deal found 9/8![Multiple Airlines logo]()
$1,043
This Mytrip deal was found by Cheapflights users on 9/9. 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.
Wed 12/92:35 pm -
2 stops23h 45m
Mon 12/146:30 am -
2 stops18h 30m
Deal found 9/9![Multiple Airlines logo]()
$1,043
This Mytrip deal was found by Cheapflights users on 9/11. 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 10/113:55 pm -
3 stops22h 40m
Sun 10/189:55 am -
2 stops18h 45m
Deal found 9/11![Multiple Airlines logo]()
$1,067
This Mytrip deal was found by Cheapflights users on 9/9. 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 11/202:30 pm -
3 stops24h 05m
Sat 11/283:25 pm -
3 stops33h 35m
Deal found 9/9![Multiple Airlines logo]()
$1,225
Last-minute flights from Seattle to Belfast IntlDiscover last-minute flight deals from Seattle to Belfast Intl. Data last updated September 11, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Belfast Intl. Data last updated September 11, 2026 and is based on user searches.
This Mytrip deal was found by Cheapflights users on 9/10. 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 9/217:10 pm -
2 stops19h 55m
Tue 10/65:55 am -
2 stops19h 15m
Deal found 9/10![Multiple Airlines logo]()
$855
This Mytrip deal was found by Cheapflights users on 9/8. 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 10/93:40 pm -
2 stops21h 20m
Thu 10/156:10 am -
2 stops22h 30m
Deal found 9/8![Multiple Airlines logo]()
$1,043
This Mytrip deal was found by Cheapflights users on 9/11. 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 10/113:55 pm -
3 stops22h 40m
Sun 10/189:55 am -
2 stops18h 45m
Deal found 9/11![Multiple Airlines logo]()
$1,067
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 September 11, 2026.
Most accurate provider | Ovago 3 stars |
|---|---|
Most trusted provider | Ovago 3 stars |
Round-trip from | $855 (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 September 11, 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
Mon 9/21
9:55 am-10:40 am
2 stops40h 45m
Belfast Intl
Tue 10/6
8:15 pm-7:00 pm
1 stop30h 45m
$1,008
SeattleBelfast
SEA Seattle/Tacoma Intl - BFS Belfast Intl
SEABFS
Seattle/Tacoma Intl
Fri 10/9
3:40 pm-9:00 pm
2 stops21h 20m
Belfast Intl
Thu 10/15
6:10 am-8:40 pm
2 stops22h 30m
$1,043
SeattleBelfast
SEA Seattle/Tacoma Intl - BFS Belfast Intl
SEABFS
Seattle/Tacoma Intl
Wed 12/9
2:35 pm-10:20 pm
2 stops23h 45m
Belfast Intl
Mon 12/14
6:30 am-5:00 pm
2 stops18h 30m
$1,043
Quickest round-trip
SeattleBelfast
SEA Seattle/Tacoma Intl - BFS Belfast Intl
SEABFS
Seattle/Tacoma Intl
Sun 10/11
3:55 pm-10:35 pm
3 stops22h 40m
Belfast Intl
Sun 10/18
9:55 am-8:40 pm
2 stops18h 45m
$1,067
SeattleBelfast
SEA Seattle/Tacoma Intl - BFS Belfast Intl
SEABFS
Seattle/Tacoma Intl
Fri 11/20
2:30 pm-10:35 pm
3 stops24h 05m
Belfast Intl
Sat 11/28
3:25 pm-5:00 pm
3 stops33h 35m
$1,225
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 September.
| 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 September 11, 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.
Boarding
7.0
Overall
6.7
Comfort
6.8
Food
6.4
Entertainment
6.5
Crew
7.7
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
IAH - LHR
Boarding
7.0
Overall
6.7
Comfort
6.8
Food
6.4
Entertainment
6.5
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.
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Seattle and Belfast Intl flights
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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 September 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$822 | Average$1,113 | FlexibilityNo cancel fee | On-time70% |