Cheap flights from Belfast Intl Airport to Washington from £516
This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 16/3. Fares are subject to change and may not be available on all flights or dates of travel.
Cheap flight deals from Belfast Intl to Washington
Cheapest flights from Belfast Intl to WashingtonExplore the most affordable flight options available from Belfast Intl to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 8 October 2026.
Explore the most affordable flight options available from Belfast Intl to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 8 October 2026.
Best flights from Belfast Intl to WashingtonDiscover carefully curated flight deals from Belfast Intl to Washington that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 8 October 2026.
Discover carefully curated flight deals from Belfast Intl to Washington that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 8 October 2026.
Last-minute flights from Belfast Intl to WashingtonDiscover last-minute flight deals from Belfast Intl to Washington. Data last updated 8 October 2026 and is based on user searches.
Discover last-minute flight deals from Belfast Intl to Washington. Data last updated 8 October 2026 and is based on user searches.
Cheapflights Fare Finder
Use the filters below to find and compare flights from Belfast Intl Airport to Washington that are best for you.
Fly from
Fly to
Route
Depart
Return
BelfastSeattle
BFS Belfast Intl - SEA Seattle/Tacoma Intl
BFSSEA
Belfast Intl
Tue 16/3
07:00-18:00
2 stops18h 00m
Seattle/Tacoma Intl
Tue 23/3
19:00-21:30
2 stops19h 30m
BelfastSeattle
BFS Belfast Intl - SEA Seattle/Tacoma Intl
BFSSEA
Belfast Intl
Thu 19/11
09:05-17:00
2 stops15h 55m
Seattle/Tacoma Intl
Thu 26/11
14:35-19:50
2 stops21h 15m
BelfastSeattle
BFS Belfast Intl - SEA Seattle/Tacoma Intl
BFSSEA
Belfast Intl
Wed 18/11
08:20-17:00
2 stops16h 40m
Seattle/Tacoma Intl
Wed 25/11
14:35-16:15
2 stops17h 40m
BelfastSeattle
BFS Belfast Intl - SEA Seattle/Tacoma Intl
BFSSEA
Belfast Intl
Sun 1/11
15:20-15:55
2 stops32h 35m
Seattle/Tacoma Intl
Sat 7/11
17:50-20:25
2 stops18h 35m
BelfastSeattle
BFS Belfast Intl - SEA Seattle/Tacoma Intl
BFSSEA
Belfast Intl
Mon 15/3
08:40-18:00
2 stops16h 20m
Seattle/Tacoma Intl
Mon 22/3
07:45-19:10
2 stops28h 25m
Best time to book a flight from Belfast Intl to Washington
Have a flexible travel schedule? Discover the best time to fly to Washington from Belfast Intl with our price prediction graph.
Cheapflights Insights
Everything you need to know about your flight from Belfast Intl Airport to Washington
Related info for your journey
Find useful and relevant information for your journey from Belfast Intl to Washington. 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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Alternative routes for Belfast Intl to Washington
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Complete your trip
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Direct flights to United States
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Belfast Intl and Washington flights
Browse other Belfast Intl and Washington flight options. Last updated on 8 October 2026.
Popular flight searches
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Can Cheapflights find flights from Belfast Intl to Washington with no change fees?
Need flexible booking options for your flight to Washington from Belfast Intl? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.
Can Cheapflights notify me if prices for flights from Belfast Intl to Washington become cheaper?
Yes, Cheapflights offers price alerts on Belfast Intl to Washington 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.