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Cheap flights from Belfast to Washington, D.C. Dulles Intl Airport from £326

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 20/7. Fares are subject to change and may not be available on all flights or dates of travel.
BHD — IAD
21 Jul — 28 Jul1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Belfast to Dulles Intl

Enter your travel dates to find the best prices.

Cheapest flights from Belfast to Dulles Intl
Explore the most affordable flight options available from Belfast to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 June 2026.

Tue 27/1008:45
BHD
-
IAD
1 stop11h 50m
British Airways
Fri 30/1022:45
IAD
-
BHD
1 stop11h 30m
British Airways
Deal found 20/6£566
Sat 5/907:05
BHD
-
IAD
1 stop17h 35m
British Airways
Tue 8/922:25
IAD
-
BHD
1 stop11h 55m
British Airways
Deal found 19/6£595
Wed 7/1019:40
BHD
-
IAD
2 stops28h 10m
British Airways
Sun 11/1019:15
IAD
-
BHD
1 stop10h 15m
British Airways
Deal found 19/6£630
Fri 17/716:25
BFS
-
IAD
2 stops27h 45m
Multiple Airlines
Thu 23/720:30
IAD
-
BFS
2 stops20h 10m
Multiple Airlines
Deal found 17/6£891
Mon 27/720:35
BFS
-
IAD
3 stops29h 51m
Multiple Airlines
Fri 31/717:15
IAD
-
BFS
2 stops18h 15m
Multiple Airlines
Deal found 19/6£905
Fri 17/706:30
BFS
-
IAD
2 stops17h 30m
Multiple Airlines
Fri 24/718:15
IAD
-
BFS
2 stops22h 00m
Multiple Airlines
Deal found 17/6£998

Find flight deals from Belfast to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Belfast (BF1) to Dulles Intl (IAD). 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 21 June 2026.

Round-trip from

£566

One-way from

£326
British Airways
  • British Airways
  • 27/10-30/10
  • 2 total stops
  • 23h 20m total
  • Belfast to Washington, D.C.
Search Deals
20/7
  • 20/7
  • 3 total stops
  • 54h 45m total
  • Belfast to Washington, D.C.
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Belfast to Dulles Intl 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 21 June 2026.
Use the filters below to find and compare flights from Belfast to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Sat 5/9

09:35-20:20

1 stop15h 45m

Washington, D.C. Dulles Intl

Tue 8/9

17:34-17:35

2 stops19h 01m

£596
Fastest return journey

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Tue 27/10

08:45-20:30

2 stops15h 45m

Washington, D.C. Dulles Intl

Fri 30/10

22:00-17:15

2 stops15h 15m

£620

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Wed 7/10

19:40-18:50

2 stops28h 10m

Washington, D.C. Dulles Intl

Sun 11/10

19:15-10:30

1 stop10h 15m

£631

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Fri 17/7

09:50-23:13

2 stops18h 23m

Washington, D.C. Dulles Intl

Fri 24/7

12:29-09:20

2 stops15h 51m

£659

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Fri 17/7

16:25-15:10

2 stops27h 45m

Washington, D.C. Dulles Intl

Thu 23/7

20:30-21:40

2 stops20h 10m

£891

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Mon 27/7

20:35-21:26

3 stops29h 51m

Washington, D.C. Dulles Intl

Fri 31/7

17:15-16:30

2 stops18h 15m

£905

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Fri 17/7

06:30-19:00

2 stops17h 30m

Washington, D.C. Dulles Intl

Fri 24/7

18:15-21:15

2 stops22h 00m

£998
Cheapest one-way

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Tue 30/6

23:30-10:25

2 stops39h 55m

£372

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Thu 2/7

06:40-10:25

2 stops32h 45m

£372

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Sun 5/7

22:05-10:25

3 stops41h 20m

£403

Flights are sorted by cheapest return flights first.

Deals found on 17/6

Showing 1-10 of 27 resultsSorted by cheapest first
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Best time to book a flight from Belfast to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Belfast with our price prediction graph.
Estimated return 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 Washington, D.C. Dulles Intl Airport
No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Belfast to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Belfast to Washington, D.C. Dulles Intl Airport?

    Airlines like British Airways fly from Belfast to Washington, D.C. Dulles Intl Airport in about 15h 45m. The time it takes to get you to your destination can typically vary by up to . Airlines will cover a distance of 3390 mi.

  • Can I find deals for flights from Belfast to Dulles Intl that include hotel bookings?

    Yes. In addition to deals on Belfast to Dulles Intl flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Belfast to Dulles Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Belfast to Dulles Intl.

  • Can I find deals for business class flights from Belfast to Dulles Intl?

    Yes. Cheapflights offers flight deals from Belfast to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Travelling to a place near Washington, D.C. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Silver Spring
Hanover
Oxon Hill
Gaithersburg
Woodbridge
Alexandria
Sterling

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Belfast to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.
Belfast City to Reagan-National flights
Belfast City to Dulles Intl flights
Belfast Intl to Baltimore flights
Belfast City to Baltimore flights

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 Dulles Intl?

Cheapflights helps you search for flights from Belfast to Dulles Intl via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Belfast to Dulles Intl?

Millions of users choose and trust Cheapflights to book the best flight deals from Belfast to Dulles Intl 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 Dulles Intl with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Belfast to Dulles Intl, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Belfast to Dulles Intl become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Dulles Intl from Belfast today and book when prices fit your budget.

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