$353+ Cheap flights from Seattle (SEA) to Belfast
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 11/23. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BHD
Dec 10 — Dec 171
Round-trip
1 adult, Economy
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Find cheap flights from Seattle to Belfast 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
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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
Cheapest
Best
Last-minute
One-way
Cheapest flights from Seattle to BelfastExplore the most affordable flight options available from Seattle to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 10, 2026.
Explore the most affordable flight options available from Seattle to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 10, 2026.
This KLM deal was found by Cheapflights users on 11/9. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/187:15 am -
2 stops17h 55m
Wed 12/25:15 pm -
1 stop26h 35m
Deal found 11/9![KLM logo]()
$1,149
This FlightHub deal was found by Cheapflights users on 11/9. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/306:45 pm -
1 stop15h 50m
Sun 12/138:30 pm -
1 stop28h 20m
Deal found 11/9![British Airways logo]()
$1,166
This American Airlines deal was found by Cheapflights users on 11/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/3010:33 am -
2 stops19h 42m
Sun 12/1312:00 pm -
2 stops20h 47m
Deal found 11/9![American Airlines logo]()
$1,193
This Ovago deal was found by Cheapflights users on 11/9. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/182:35 pm -
1 stop18h 10m
Wed 12/25:15 pm -
1 stop26h 35m
Deal found 11/9![Air Europa logo]()
$1,215
This Cathay Pacific deal was found by Cheapflights users on 11/9. 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 Cathay Pacific is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/306:00 am -
3 stops42h 25m
Sun 12/135:35 pm -
2 stops47h 10m
Deal found 11/9![Multiple Airlines logo]()
$13,022
This Cathay Pacific deal was found by Cheapflights users on 11/9. 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 Cathay Pacific is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/184:59 pm -
3 stops41h 46m
Wed 12/25:35 pm -
3 stops37h 26m
Deal found 11/9![Multiple Airlines logo]()
$13,416
Best flights from Seattle to BelfastDiscover carefully curated flight deals from Seattle to Belfast that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 10, 2026.
Discover carefully curated flight deals from Seattle to Belfast that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 10, 2026.
This Mytrip deal was found by Cheapflights users on 11/8. 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.
Wed 1/202:35 pm -
2 stops20h 25m
Wed 1/272:20 pm -
2 stops34h 40m
Deal found 11/8![Multiple Airlines logo]()
$850
This British Airways deal was found by Cheapflights users on 11/7. 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.
Sun 3/76:45 pm -
1 stop14h 05m
Tue 3/94:55 pm -
1 stop31h 55m
Deal found 11/7![British Airways logo]()
$901
This American Airlines deal was found by Cheapflights users on 11/6. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/110:47 am -
2 stops19h 18m
Sat 1/166:35 am -
2 stops21h 38m
Deal found 11/6![American Airlines logo]()
$1,101
This British Airways deal was found by Cheapflights users on 11/7. 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.
Sun 4/258:20 pm -
1 stop13h 20m
Wed 4/286:30 am -
1 stop19h 55m
Deal found 11/7![British Airways logo]()
$906
This Expedia deal was found by Cheapflights users on 11/8. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/206:45 pm -
1 stop16h 20m
Wed 1/279:15 am -
1 stop15h 35m
Deal found 11/8![British Airways logo]()
$958
This FlightHub deal was found by Cheapflights users on 11/6. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/16:45 pm -
1 stop16h 25m
Sat 1/166:35 am -
2 stops21h 38m
Deal found 11/6![British Airways logo]()
$1,089
Last-minute flights from Seattle to BelfastDiscover last-minute flight deals from Seattle to Belfast. Data last updated November 10, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Belfast. Data last updated November 10, 2026 and is based on user searches.
This KLM deal was found by Cheapflights users on 11/9. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/187:15 am -
2 stops17h 55m
Wed 12/25:15 pm -
1 stop26h 35m
Deal found 11/9![KLM logo]()
$1,149
This Ovago deal was found by Cheapflights users on 11/9. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/182:35 pm -
1 stop18h 10m
Wed 12/25:15 pm -
1 stop26h 35m
Deal found 11/9![Air Europa logo]()
$1,215
This Cathay Pacific deal was found by Cheapflights users on 11/9. 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 Cathay Pacific is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/184:59 pm -
3 stops41h 46m
Wed 12/25:35 pm -
3 stops37h 26m
Deal found 11/9![Multiple Airlines logo]()
$13,416
This FlightHub deal was found by Cheapflights users on 11/9. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/306:45 pm -
1 stop15h 50m
Sun 12/138:30 pm -
1 stop28h 20m
Deal found 11/9![British Airways logo]()
$1,166
This American Airlines deal was found by Cheapflights users on 11/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/3010:33 am -
2 stops19h 42m
Sun 12/1312:00 pm -
2 stops20h 47m
Deal found 11/9![American Airlines logo]()
$1,193
This Cathay Pacific deal was found by Cheapflights users on 11/9. 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 Cathay Pacific is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/306:00 am -
3 stops42h 25m
Sun 12/135:35 pm -
2 stops47h 10m
Deal found 11/9![Multiple Airlines logo]()
$13,022
One-way flights from Seattle to BelfastSearch for one-way flight options from Seattle to Belfast. Find affordable one-way fares based on user searches. Data last updated November 10, 2026.
Search for one-way flight options from Seattle to Belfast. Find affordable one-way fares based on user searches. Data last updated November 10, 2026.
This Kiwi.com deal was found by Cheapflights users on 11/5. 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 11/232:35 pm -
3 stops39h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![Multiple Airlines logo]()
$353
This Kiwi.com deal was found by Cheapflights users on 11/5. 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 11/252:35 pm -
3 stops42h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![Multiple Airlines logo]()
$364
This Kiwi.com deal was found by Cheapflights users on 11/5. 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 11/262:35 pm -
3 stops45h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![Multiple Airlines logo]()
$386
This Kiwi.com deal was found by Cheapflights users on 11/5. 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.
Sat 11/282:35 pm -
3 stops38h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![Multiple Airlines logo]()
$402
This Kiwi.com deal was found by Cheapflights users on 11/5. 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.
Fri 11/272:35 pm -
3 stops34h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![Multiple Airlines logo]()
$403
This Kiwi.com deal was found by Cheapflights users on 11/5. 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 11/248:31 am -
3 stops20h 39m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/5![Multiple Airlines logo]()
$543
Find flight deals from Seattle to Belfast
Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Belfast (BF1). 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 November 10, 2026.
Round-trip from | $850 (Mytrip) |
|---|---|
One-way from | $353 (Kiwi.com) |
Cheapflights Fare Finder
Customize your flight search to find flights from Seattle to Belfast 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 November 10, 2026.
Use the filters below to find and compare flights from Seattle to Belfast that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
SeattleBelfast
SEA Seattle/Tacoma Intl - BHD Belfast City
SEABHD
Seattle/Tacoma Intl
Mon 11/23
2:35 pm-1:55 pm
3 stops39h 20m
Belfast City
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$353
SeattleBelfast
SEA Seattle/Tacoma Intl - BHD Belfast City
SEABHD
Seattle/Tacoma Intl
Fri 11/27
2:35 pm-5:20 pm
2 stops18h 45m
Belfast City
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$479
Quickest round-trip
SeattleBelfast
SEA Seattle/Tacoma Intl - BHD Belfast City
SEABHD
Seattle/Tacoma Intl
Mon 11/23
6:45 pm-3:55 pm
1 stop13h 10m
Belfast City
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$573
SeattleBelfast
SEA Seattle/Tacoma Intl - BHD Belfast City
SEABHD
Seattle/Tacoma Intl
Sat 11/28
1:40 pm-2:15 pm
1 stop16h 35m
Belfast City
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$623
SeattleBelfast
SEA Seattle/Tacoma Intl - BHD Belfast City
SEABHD
Seattle/Tacoma Intl
Fri 11/27
6:45 pm-7:10 pm
1 stop16h 25m
Belfast City
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$623
SeattleBelfast
SEA Seattle/Tacoma Intl - BHD Belfast City
SEABHD
Seattle/Tacoma Intl
Sun 11/22
6:45 pm-4:50 pm
1 stop14h 05m
Belfast City
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$633
SeattleBelfast
SEA Seattle/Tacoma Intl - BHD Belfast City
SEABHD
Seattle/Tacoma Intl
Wed 1/20
2:35 pm-7:00 pm
2 stops20h 25m
Belfast City
Wed 1/27
2:20 pm-5:00 pm
2 stops34h 40m
$850
SeattleBelfast
SEA Seattle/Tacoma Intl - BHD Belfast City
SEABHD
Seattle/Tacoma Intl
Sun 3/7
6:45 pm-4:50 pm
1 stop14h 05m
Belfast City
Tue 3/9
4:55 pm-4:50 pm
1 stop31h 55m
$901
SeattleBelfast
SEA Seattle/Tacoma Intl - BHD Belfast City
SEABHD
Seattle/Tacoma Intl
Sun 4/25
8:20 pm-5:40 pm
1 stop13h 20m
Belfast City
Wed 4/28
6:30 am-6:25 pm
1 stop19h 55m
$906
SeattleBelfast
SEA Seattle/Tacoma Intl - BHD Belfast City
SEABHD
Seattle/Tacoma Intl
Wed 1/20
6:45 pm-7:05 pm
1 stop16h 20m
Belfast City
Wed 1/27
9:15 am-4:50 pm
1 stop15h 35m
$958
Showing 1-10 of 12 resultsSorted by cheapest first
Best time to book a flight from Seattle to Belfast
Have a flexible travel schedule? Discover the best time to fly to Belfast from Seattle with our price prediction graph.
SEA-BF1
SEA-BHD
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 Seattle to Belfast
SEA-BF1
SEA-BHD
No data available for this route at this time. Please check back soon.
Reviews of airlines servicing Belfast
Get insights into the airlines that provide service to Belfast. 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. Reviews last updated November 10, 2026.
Read reviews from past customers who have flown British Airways from Seattle to Belfast. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
6.7
Comfort
6.8
Crew
7.7
Boarding
7.0
Entertainment
6.5
Food
6.4
Reviews
1 / 20
10.0
ExcellentAnonymous,Jun 2026
IAH - LHR
Overall
6.7
Comfort
6.8
Crew
7.7
Boarding
7.0
Entertainment
6.5
Food
6.4
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. 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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Complete your trip
Complete your trip to Belfast by adding a car rental and/or hotel reservation to your travel itinerary.
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Seattle and Belfast flights
Browse other Seattle and Belfast flight options. Last updated on November 10, 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 November 10, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top airline flying from Seattle to Belfast
Discover the top airline that operate flights from Seattle to Belfast. 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 November 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$804 | Average$1,113 | FlexibilityNo cancel fee | On-time70% |