$439+ Cheap flights from Belfast to Seattle (SEA)
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 8/31. Fares are subject to change and may not be available on all flights or dates of travel.
BHD — SEA
Sep 14 — Sep 211
Round-trip
1 adult, Economy
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Find cheap flights from Belfast to Seattle 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 Belfast to Seattle
Cheapest
Best
Last-minute
One-way
Cheapest flights from Belfast to SeattleExplore the most affordable flight options available from Belfast to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 15, 2026.
Explore the most affordable flight options available from Belfast to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 15, 2026.
This Trip.com deal was found by Cheapflights users on 8/15. 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.
Tue 9/298:20 am -
2 stops20h 20m
Tue 10/67:00 pm -
2 stops18h 05m
Deal found 8/15![Multiple Airlines logo]()
$779
This Mytrip deal was found by Cheapflights users on 8/13. 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 9/279:10 pm -
3 stops44h 30m
Sun 10/43:40 pm -
2 stops21h 20m
Deal found 8/13![Multiple Airlines logo]()
$884
This British Airways deal was found by Cheapflights users on 8/13. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/57:40 am -
1 stop17h 10m
Mon 11/96:12 am -
2 stops24h 03m
Deal found 8/13![British Airways logo]()
$975
This British Airways deal was found by Cheapflights users on 8/11. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/711:35 am -
1 stop32h 00m
Sun 10/118:20 pm -
1 stop16h 15m
Deal found 8/11![British Airways logo]()
$976
This British Airways deal was found by Cheapflights users on 8/13. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/146:30 am -
1 stop13h 05m
Sat 10/178:20 pm -
1 stop13h 55m
Deal found 8/13![British Airways logo]()
$1,069
This oojo deal was found by Cheapflights users on 8/10. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/206:30 pm -
2 stops30h 40m
Mon 8/247:10 pm -
2 stops17h 40m
Deal found 8/10![Aer Lingus logo]()
$4,440
This oojo deal was found by Cheapflights users on 8/13. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/199:50 am -
2 stops15h 20m
Mon 8/247:10 pm -
2 stops17h 55m
Deal found 8/13![Aer Lingus logo]()
$4,463
Best flights from Belfast to SeattleDiscover carefully curated flight deals from Belfast to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 15, 2026.
Discover carefully curated flight deals from Belfast to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 15, 2026.
This Trip.com deal was found by Cheapflights users on 8/15. 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.
Tue 9/298:20 am -
2 stops20h 20m
Tue 10/67:00 pm -
2 stops18h 05m
Deal found 8/15![Multiple Airlines logo]()
$779
This British Airways deal was found by Cheapflights users on 8/13. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/57:40 am -
1 stop17h 10m
Mon 11/96:12 am -
2 stops24h 03m
Deal found 8/13![British Airways logo]()
$975
This Mytrip deal was found by Cheapflights users on 8/13. 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 9/279:10 pm -
3 stops44h 30m
Sun 10/43:40 pm -
2 stops21h 20m
Deal found 8/13![Multiple Airlines logo]()
$884
This British Airways deal was found by Cheapflights users on 8/12. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/144:05 pm -
1 stop27h 30m
Sun 10/188:20 pm -
1 stop16h 15m
Deal found 8/12![British Airways logo]()
$976
This British Airways deal was found by Cheapflights users on 8/11. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/710:05 am -
1 stop16h 20m
Sun 10/116:12 am -
2 stops24h 23m
Deal found 8/11![British Airways logo]()
$976
Last-minute flights from Belfast to SeattleDiscover last-minute flight deals from Belfast to Seattle. Data last updated August 15, 2026 and is based on user searches.
Discover last-minute flight deals from Belfast to Seattle. Data last updated August 15, 2026 and is based on user searches.
This oojo deal was found by Cheapflights users on 8/13. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/199:50 am -
2 stops15h 20m
Mon 8/247:10 pm -
2 stops17h 55m
Deal found 8/13![Aer Lingus logo]()
$4,463
This KLM deal was found by Cheapflights users on 8/10. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/195:30 pm -
1 stop26h 07m
Mon 8/245:45 pm -
1 stop15h 10m
Deal found 8/10![KLM logo]()
$7,934
This Delta deal was found by Cheapflights users on 8/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/199:50 am -
1 stop14h 37m
Mon 8/246:05 am -
2 stops19h 15m
Deal found 8/14![Delta logo]()
$7,949
This oojo deal was found by Cheapflights users on 8/10. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/206:30 pm -
2 stops30h 40m
Mon 8/247:10 pm -
2 stops17h 40m
Deal found 8/10![Aer Lingus logo]()
$4,440
This TravelUp deal was found by Cheapflights users on 8/11. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/209:50 am -
1 stop14h 37m
Mon 8/241:50 pm -
1 stop19h 05m
Deal found 8/11![Virgin Atlantic logo]()
$7,340
This Expedia deal was found by Cheapflights users on 8/11. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/209:50 am -
2 stops20h 15m
Mon 8/248:59 am -
2 stops16h 21m
Deal found 8/11![Multiple Airlines logo]()
$7,691
This Mytrip deal was found by Cheapflights users on 8/13. 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 9/279:10 pm -
3 stops44h 30m
Sun 10/43:40 pm -
2 stops21h 20m
Deal found 8/13![Multiple Airlines logo]()
$884
This Trip.com deal was found by Cheapflights users on 8/15. 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.
Tue 9/298:20 am -
2 stops20h 20m
Tue 10/67:00 pm -
2 stops18h 05m
Deal found 8/15![Multiple Airlines logo]()
$779
One-way flights from Belfast to SeattleSearch for one-way flight options from Belfast to Seattle. Find affordable one-way fares based on user searches. Data last updated August 15, 2026.
Search for one-way flight options from Belfast to Seattle. Find affordable one-way fares based on user searches. Data last updated August 15, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/13. 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 8/312:40 pm -
3 stops54h 42m
Deal found 8/13![Multiple Airlines logo]()
$439
This Kiwi.com deal was found by Cheapflights users on 8/10. 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 11/210:10 am -
3 stops55h 41m
Deal found 8/10![Multiple Airlines logo]()
$490
This Kiwi.com deal was found by Cheapflights users on 8/13. 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 8/319:50 am -
3 stops43h 10m
Deal found 8/13![Multiple Airlines logo]()
$583
This Expedia deal was found by Cheapflights users on 8/10. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/211:40 am -
1 stop13h 10m
Deal found 8/10![British Airways logo]()
$610
This Kiwi.com deal was found by Cheapflights users on 8/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/276:10 am -
3 stops35h 09m
Deal found 8/11![Multiple Airlines logo]()
$622
This Kiwi.com deal was found by Cheapflights users on 8/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2610:45 pm -
3 stops52h 00m
Deal found 8/11![Multiple Airlines logo]()
$627
This Kiwi.com deal was found by Cheapflights users on 8/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2712:20 pm -
3 stops38h 25m
Deal found 8/11![Multiple Airlines logo]()
$634
This Justfly.com deal was found by Cheapflights users on 8/11. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/266:30 pm -
2 stops30h 40m
Deal found 8/11![Aer Lingus logo]()
$665
This Kiwi.com deal was found by Cheapflights users on 8/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/37:50 am -
2 stops41h 10m
Deal found 8/11![Multiple Airlines logo]()
$668
This Kiwi.com deal was found by Cheapflights users on 8/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/267:00 am -
3 stops34h 19m
Deal found 8/11![Multiple Airlines logo]()
$696
This Kiwi.com deal was found by Cheapflights users on 8/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/38:00 pm -
2 stops29h 00m
Deal found 8/11![Multiple Airlines logo]()
$708
This Cheapflightsfares deal was found by Cheapflights users on 8/11. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/276:50 am -
2 stops18h 20m
Deal found 8/11![Aer Lingus logo]()
$723
Find flight deals from Belfast to Seattle
Discover tips and strategies to find the most affordable flight options for your journey from Belfast (BF1) to Seattle (SEA). 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 August 15, 2026.
Round-trip from | $779 (Trip.com) |
|---|---|
One-way from | $439 (Kiwi.com) |
Cheapflights Fare Finder
Customize your flight search to find flights from Belfast to Seattle 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 August 15, 2026.
Use the filters below to find and compare flights from Belfast to Seattle that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
BelfastSeattle
BFS Belfast Intl - SEA Seattle/Tacoma Intl
BFSSEA
Belfast Intl
Tue 9/29
8:20 am-8:40 pm
2 stops20h 20m
Seattle/Tacoma Intl
Tue 10/6
7:00 pm-9:05 pm
2 stops18h 05m
$779
BelfastSeattle
BFS Belfast Intl - SEA Seattle/Tacoma Intl
BFSSEA
Belfast Intl
Sun 9/27
9:10 pm-9:40 am
3 stops44h 30m
Seattle/Tacoma Intl
Sun 10/4
3:40 pm-9:00 pm
2 stops21h 20m
$884
BelfastSeattle
BHD Belfast City - SEA Seattle/Tacoma Intl
BHDSEA
Belfast City
Thu 11/5
7:40 am-4:50 pm
1 stop17h 10m
Seattle/Tacoma Intl
Mon 11/9
6:12 am-2:15 pm
2 stops24h 03m
$975
BelfastSeattle
BHD Belfast City - SEA Seattle/Tacoma Intl
BHDSEA
Belfast City
Wed 10/14
4:05 pm-11:35 am
1 stop27h 30m
Seattle/Tacoma Intl
Sun 10/18
8:20 pm-8:35 pm
1 stop16h 15m
$976
BelfastSeattle
BHD Belfast City - SEA Seattle/Tacoma Intl
BHDSEA
Belfast City
Wed 10/7
10:05 am-6:25 pm
1 stop16h 20m
Seattle/Tacoma Intl
Sun 10/11
6:12 am-2:35 pm
2 stops24h 23m
$976
Cheapest one-way
BelfastSeattle
BFS Belfast Intl - SEA Seattle/Tacoma Intl
BFSSEA
Belfast Intl
Mon 8/31
2:40 pm-1:22 pm
3 stops54h 42m
$439
BelfastSeattle
BHD Belfast City - SEA Seattle/Tacoma Intl
BHDSEA
Belfast City
Mon 11/2
10:10 am-9:51 am
3 stops55h 41m
$490
BelfastSeattle
BFS Belfast Intl - SEA Seattle/Tacoma Intl
BFSSEA
Belfast Intl
Wed 8/26
10:45 pm-6:45 pm
3 stops52h 00m
$627
BelfastSeattle
BHD Belfast City - SEA Seattle/Tacoma Intl
BHDSEA
Belfast City
Wed 8/26
6:30 pm-5:10 pm
2 stops30h 40m
$665
BelfastSeattle
BFS Belfast Intl - SEA Seattle/Tacoma Intl
BFSSEA
Belfast Intl
Sun 1/3
7:50 am-5:00 pm
2 stops41h 10m
$668
Showing 1-10 of 15 resultsSorted by cheapest first
Best time to book a flight from Belfast to Seattle
Have a flexible travel schedule? Discover the best time to fly to Seattle from Belfast with our price prediction graph.
BF1-SEA
BFS-SEA
BHD-SEA
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.
Cheapflights Insights
Everything you need to know about your flight from Belfast to Seattle
BF1-SEA
BFS-SEA
BHD-SEA
No data available for this route at this time. Please check back soon.
Related info for your journey
Find useful and relevant information for your journey from Belfast to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Seattle?
Book flights to Seattle if you plan to visit one of these locationsSeaTac
Renton
Tacoma
Lacey
Leavenworth
Olympia
Tukwila
Edmonds
Snoqualmie
Lynnwood
Tumwater
Centralia
Puyallup
Marysville
Kent
Ellensburg
Fife
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Lakewood
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