Cheap flights from Belfast to Seattle from £517
This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 30/9. Fares are subject to change and may not be available on all flights or dates of travel.
Cheap 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 4 July 2025.
Round-trip from | £517 |
---|---|
Popular in | July |
Cheapest in | May |
Average price | £802 |
Find flight deals from Belfast to Seattle
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 4 July 2025.
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 4 July 2025.
Cheapflights Fare Finder
Customise 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 858,174 searches. Data last updated 4 July 2025.
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
Price
BelfastSeattle
BHD - SEA
BHDSEA
Belfast City
Tue 30/9
20:20-11:35
1 stop23h 15m
Seattle/Tacoma Intl
Thu 16/10
20:20-18:45
1 stop14h 25m
BelfastSeattle
BHD - SEA
BHDSEA
Belfast City
Tue 30/9
20:20-20:09
2 stops31h 49m
Seattle/Tacoma Intl
Thu 16/10
13:30-13:15
1 stop15h 45m
BelfastSeattle
BHD - SEA
BHDSEA
Belfast City
Mon 14/7
17:25-15:50
1 stop30h 25m
Seattle/Tacoma Intl
Mon 21/7
17:35-21:15
1 stop19h 40m
BelfastSeattle
BHD - SEA
BHDSEA
Belfast City
Mon 14/7
06:40-10:34
2 stops35h 54m
Seattle/Tacoma Intl
Mon 21/7
20:20-17:30
1 stop13h 10m
BelfastSeattle
BFS - SEA
BFSSEA
Belfast Intl
Mon 14/7
10:00-10:37
2 stops32h 37m
Seattle/Tacoma Intl
Mon 21/7
09:50-14:20
2 stops20h 30m
BelfastSeattle
BHD - SEA
BHDSEA
Belfast City
Wed 30/7
06:55-21:43
2 stops22h 48m
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.
Cheapflights Insights
Everything you need to know about your flight from Belfast to Seattle
What is the cheapest time of day to fly from BFS to SEA?
Find hourly flight availability from Belfast to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 4 July 2025.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Belfast to Seattle as you normally would.
Reviews of airlines servicing Seattle
Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated 4 July 2025.
Read through reviews of airlines operating flights from Belfast to Seattle, such as Delta, American Airlines, andBritish Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Boarding
Entertainment
Comfort
Food
Overall
Crew
Reviews
Kim,May 2025
PIH - SLC
Boarding
Entertainment
Comfort
Food
Overall
Crew
Reviews
Kim,May 2025
PIH - SLC
Boarding
Entertainment
Comfort
Food
Overall
Crew
Reviews
Kim,May 2025
PIH - SLC
Boarding
Entertainment
Comfort
Food
Overall
Crew
Reviews
Kim,May 2025
PIH - SLC
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.
Travelling to a place near Belfast?
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Alternative routes for Belfast to Seattle
See prices for flight routes from nearby airports that may be better suited for you.
Top airline flying from Belfast to Seattle
Discover the top airline that operate flights from Belfast to Seattle. 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 858,174 searches. Data last updated 4 July 2025.
Fly with Cheapflights
Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.
How does Cheapflights help users find flights from Belfast to Seattle?
Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Belfast to Seattle. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.
Why should you use Cheapflights to find cheap flight tickets from Belfast to Seattle?
Millions of users choose and trust Cheapflights to book the best flight deals from Belfast to Seattle for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.
Can Cheapflights find flights from Belfast to Seattle with no change fees?
Certainly. Search results for flights to Seattle from Belfast shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.
Can Cheapflights notify me if prices for flights from Belfast to Seattle become cheaper?
Yes, Cheapflights offers price alerts on Belfast to Seattle flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.