$565+ Cheap flights from Belfast to Seattle (SEA)
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 3/26. Fares are subject to change and may not be available on all flights or dates of travel.
BHD — SEA
Dec 13 — Dec 201
Round-trip
1 adult, Economy
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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
Best
One-way
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 November 13, 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 November 13, 2026.
This Iberia deal was found by Cheapflights users on 11/12. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/178:40 am -
1 stop34h 45m
Sun 2/216:45 pm -
1 stop14h 05m
Deal found 11/12![Iberia logo]()
$1,011
This British Airways deal was found by Cheapflights users on 11/10. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/58:35 pm -
1 stop23h 00m
Sun 5/95:40 pm -
2 stops18h 55m
Deal found 11/10![British Airways logo]()
$1,030
This Iberia deal was found by Cheapflights users on 11/10. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/215:50 pm -
2 stops38h 53m
Sun 1/249:58 am -
2 stops22h 52m
Deal found 11/10![Iberia logo]()
$1,027
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 November 13, 2026.
Search for one-way flight options from Belfast to Seattle. Find affordable one-way fares based on user searches. Data last updated November 13, 2026.
This deal was found by Cheapflights users on 11/11. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/2611:50 am -
1 stop13h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 11/11![British Airways logo]()
$565
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 November 13, 2026.
Round-trip from | $1,011 (Iberia) |
|---|---|
One-way from | $565 |
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 7,457,451 searches. Data last updated November 13, 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
BHD Belfast City - SEA Seattle/Tacoma Intl
BHDSEA
Belfast City
Fri 3/26
11:50 am-5:50 pm
1 stop13h 00m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-9:00 am
Nonstop0h 00m
$565
BelfastSeattle
BHD Belfast City - SEA Seattle/Tacoma Intl
BHDSEA
Belfast City
Wed 2/17
8:40 am-11:25 am
1 stop34h 45m
Seattle/Tacoma Intl
Sun 2/21
6:45 pm-4:50 pm
1 stop14h 05m
$1,011
BelfastSeattle
BHD Belfast City - SEA Seattle/Tacoma Intl
BHDSEA
Belfast City
Thu 1/21
5:50 pm-12:43 am
2 stops38h 53m
Seattle/Tacoma Intl
Sun 1/24
9:58 am-4:50 pm
2 stops22h 52m
$1,027
BelfastSeattle
BHD Belfast City - SEA Seattle/Tacoma Intl
BHDSEA
Belfast City
Wed 5/5
8:35 pm-11:35 am
1 stop23h 00m
Seattle/Tacoma Intl
Sun 5/9
5:40 pm-8:35 pm
2 stops18h 55m
$1,030
Sorted 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
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
BHD-SEA
No data available for this route at this time. Please check back soon.
Related info for your journey
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Traveling to a place near Seattle?
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Puyallup
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Shoreline
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