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Cheap flights from Belfast to Washington, D.C. Dulles Intl Airport from £586

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 24/9. Fares are subject to change and may not be available on all flights or dates of travel.
BHD — IAD
13 Sep — 20 Sep1
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 14 August 2026.

Thu 24/906:10 -
2 stops18h 25m
Thu 1/1021:45 -
2 stops16h 35m
Deal found 10/8£586
Thu 17/917:30 -
1 stop27h 05m
Thu 1/1017:30 -
1 stop10h 50m
Deal found 12/8£662
Sun 6/907:00 -
3 stops36h 22m
Sun 13/920:30 -
2 stops19h 35m
Deal found 9/8£663
Thu 24/916:00 -
2 stops30h 00m
Thu 1/1020:20 -
2 stops19h 45m
Deal found 10/8£664
Sun 6/907:00 -
3 stops37h 55m
Sun 13/920:30 -
2 stops20h 00m
Deal found 9/8£672
Sun 6/909:45 -
1 stop10h 50m
Sun 13/917:30 -
1 stop10h 50m
Deal found 9/8£674
Thu 24/909:50 -
1 stop10h 45m
Thu 1/1011:10 -
2 stops17h 10m
Deal found 10/8£674
Thu 17/909:50 -
1 stop10h 45m
Fri 2/1018:26 -
2 stops17h 29m
Deal found 12/8£675
Thu 17/909:50 -
1 stop10h 45m
Wed 30/912:26 -
2 stops15h 54m
Deal found 12/8£678
Thu 17/909:50 -
2 stops18h 24m
Thu 1/1011:10 -
2 stops17h 10m
Deal found 12/8£679
Wed 16/909:50 -
2 stops15h 24m
Fri 2/1017:30 -
1 stop18h 25m
Deal found 12/8£682
Wed 30/920:35 -
2 stops27h 15m
Sun 4/1017:45 -
1 stop11h 45m
Deal found 13/8£688

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 14 August 2026.

Round-trip from

£586
24/9-1/10
  • 24/9-1/10
  • 4 total stops
  • 35h 00m 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 14 August 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.

BFS Belfast Intl - IAD Washington, D.C. Dulles Intl

BFSIAD

Belfast Intl

Thu 24/9

06:10-19:35

2 stops18h 25m

Washington, D.C. Dulles Intl

Thu 1/10

21:45-19:20

2 stops16h 35m

£586

BelfastWashington, D.C.

BHD Belfast City - IAD Washington, D.C. Dulles Intl

BHDIAD

Belfast City

Thu 24/9

16:00-17:00

2 stops30h 00m

Washington, D.C. Dulles Intl

Thu 1/10

20:20-21:05

2 stops19h 45m

£664
Fastest return journey

BelfastWashington, D.C.

BHD Belfast City - IAD Washington, D.C. Dulles Intl

BHDIAD

Belfast City

Sun 6/9

09:45-15:35

1 stop10h 50m

Washington, D.C. Dulles Intl

Sun 13/9

17:30-09:20

1 stop10h 50m

£674

BelfastWashington, D.C.

BHD Belfast City - IAD Washington, D.C. Dulles Intl

BHDIAD

Belfast City

Thu 24/9

17:30-15:35

1 stop27h 05m

Washington, D.C. Dulles Intl

Thu 1/10

17:30-16:55

1 stop18h 25m

£674

BelfastWashington, D.C.

BHD Belfast City - IAD Washington, D.C. Dulles Intl

BHDIAD

Belfast City

Thu 24/9

09:50-15:35

1 stop10h 45m

Washington, D.C. Dulles Intl

Thu 1/10

11:10-09:20

2 stops17h 10m

£674

BelfastWashington, D.C.

BHD Belfast City - IAD Washington, D.C. Dulles Intl

BHDIAD

Belfast City

Fri 18/9

09:50-15:35

1 stop10h 45m

Washington, D.C. Dulles Intl

Fri 2/10

12:25-16:55

2 stops23h 30m

£675

BelfastWashington, D.C.

BHD Belfast City - IAD Washington, D.C. Dulles Intl

BHDIAD

Belfast City

Wed 30/9

20:35-18:50

2 stops27h 15m

Washington, D.C. Dulles Intl

Sun 4/10

17:45-10:30

1 stop11h 45m

£689

BelfastWashington, D.C.

BFS Belfast Intl - IAD Washington, D.C. Dulles Intl

BFSIAD

Belfast Intl

Sun 6/9

09:35-19:25

2 stops14h 50m

Washington, D.C. Dulles Intl

Sun 13/9

17:15-23:35

2 stops25h 20m

£691

BelfastWashington, D.C.

BHD Belfast City - IAD Washington, D.C. Dulles Intl

BHDIAD

Belfast City

Wed 16/9

11:35-19:40

1 stop13h 05m

Washington, D.C. Dulles Intl

Fri 2/10

22:25-15:30

1 stop12h 05m

£693

BelfastWashington, D.C.

BHD Belfast City - IAD Washington, D.C. Dulles Intl

BHDIAD

Belfast City

Wed 26/8

20:35-15:55

1 stop24h 20m

Washington, D.C. Dulles Intl

Sun 30/8

19:15-10:30

1 stop10h 15m

£702

Flights are sorted by cheapest return flights first.

Deals found on 12/8

Showing 1-10 of 13 resultsSorted by cheapest first
1
2

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 KLM and Delta fly from Belfast to Washington, D.C. Dulles Intl Airport in about 10h 45m. The time it takes to get you to your destination can typically vary by up to 05m. Airlines will cover a distance of 3390 mi. This flight may include one or multiple stops.

  • 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
Gaithersburg
Oxon Hill
Alexandria
Hanover
Woodbridge
Glen Burnie
Springfield
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 Intl to Baltimore flights
Belfast City to Baltimore flights
Belfast City to Reagan-National flights
Belfast Intl to Dulles Intl flights
Belfast City to Dulles Intl 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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