Cheap flights from Northern Ireland to Washington, D.C. from £298
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 15/12. Fares are subject to change and may not be available on all flights or dates of travel.
Cheap flight deals from Northern Ireland to Washington, D.C.
Keep the following information in mind while searching for Northern Ireland to Washington, D.C. flight deals. Data was last updated 15 October 2025.
Find flight deals from Northern Ireland to Washington, D.C.
Cheapest flights from Northern Ireland to Washington, D.C.Explore the most affordable flight options available from Northern Ireland to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 15 October 2025.
Explore the most affordable flight options available from Northern Ireland to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 15 October 2025.
Cheapflights Fare Finder
Use the filters below to find and compare flights from Northern Ireland to Washington, D.C. that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
BelfastWashington, D.C.
BFS - IAD
BFSIAD
Belfast Intl
Fri 28/11
06:30-05:00
3 stops27h 30m
Washington, D.C. Dulles Intl
Fri 5/12
22:30-22:00
2 stops18h 30m
BelfastWashington, D.C.
BHD - IAD
BHDIAD
Belfast City
Thu 13/11
10:40-15:35
1 stop33h 55m
Washington, D.C. Dulles Intl
Mon 17/11
11:25-10:40
2 stops18h 15m
BelfastWashington, D.C.
BHD - IAD
BHDIAD
Belfast City
Thu 20/11
09:05-19:55
1 stop15h 50m
Washington, D.C. Dulles Intl
Mon 24/11
17:29-16:05
2 stops17h 36m
BelfastWashington, D.C.
BHD - IAD
BHDIAD
Belfast City
Thu 20/11
09:05-15:35
1 stop11h 30m
Washington, D.C. Dulles Intl
Mon 24/11
21:45-14:15
1 stop11h 30m
BelfastWashington, D.C.
BHD - DCA
BHDDCA
Belfast City
Thu 4/12
11:05-21:30
2 stops15h 25m
Washington, D.C. Reagan-National
Mon 8/12
17:22-14:15
2 stops15h 53m
BelfastWashington, D.C.
BHD - IAD
BHDIAD
Belfast City
Thu 5/3
11:05-19:55
1 stop13h 50m
Washington, D.C. Dulles Intl
Mon 9/3
14:01-14:15
2 stops20h 14m
BelfastBaltimore
BHD - BWI
BHDBWI
Belfast City
Fri 6/3
06:45-18:45
1 stop17h 00m
Baltimore/Washington
Tue 10/3
21:35-11:30
1 stop9h 55m
BelfastBaltimore
BHD - BWI
BHDBWI
Belfast City
Sun 1/3
12:10-18:45
1 stop11h 35m
Baltimore/Washington
Wed 4/3
07:54-14:15
2 stops25h 21m
BelfastWashington, D.C.
BHD - DCA
BHDDCA
Belfast City
Wed 1/4
06:30-18:06
2 stops16h 36m
Washington, D.C. Reagan-National
Sun 5/4
17:00-16:55
2 stops18h 55m
BelfastWashington, D.C.
BFS - IAD
BFSIAD
Belfast Intl
Mon 15/12
06:50-14:35
3 stops36h 45m
Best time to book a flight from Northern Ireland to Washington, D.C.
Have a flexible travel schedule? Discover the best time to fly to Washington, D.C. from Northern Ireland with our price prediction graph.
Cheapflights Insights
Everything you need to know about your flight from Northern Ireland to Washington, D.C.
What is the cheapest time of day to fly from NIR to WAS?
Find hourly flight availability from Northern Ireland to Washington, D.C.. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 15 October 2025.
When flying from Northern Ireland to Washington, D.C., the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 36% versus a flight in the afternoon.
Related info for your journey
Find useful and relevant information for your journey from Northern Ireland to Washington, D.C.. 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 Washington, D.C.?
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Alternative routes for Northern Ireland to Washington, D.C.
See prices for flight routes from nearby airports that may be better suited for you.
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How does Cheapflights help users find flights from Northern Ireland to Washington, D.C.?
Deals for Northern Ireland to Washington, D.C. flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.
Why should you use Cheapflights to find cheap flight tickets from Northern Ireland to Washington, D.C.?
It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Northern Ireland to Washington, D.C..
Can Cheapflights find flights from Northern Ireland to Washington, D.C. with no change fees?
Need flexible booking options for your flight to Washington, D.C. from Northern Ireland? 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 Northern Ireland to Washington, D.C. become cheaper?
Not ready to book yet? You can track prices for flights from Northern Ireland to Washington, D.C. on Cheapflights with our Price Alert feature and get notified when better prices are available.