Find flights
When to book
FAQs

Cheap flights from Belfast to Washington, D.C. Dulles Intl Airport from £715

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 21/5. Fares are subject to change and may not be available on all flights or dates of travel.
BHD — IAD
4 Jun — 11 Jun1
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 5 May 2026.

Thu 21/506:40
BFS
-
IAD
2 stops14h 05m
Multiple Airlines
Mon 25/517:15
IAD
-
BFS
2 stops13h 00m
Multiple Airlines
Deal found 5/5£715
Mon 24/820:15
BFS
-
IAD
3 stops47h 55m
Multiple Airlines
Sat 29/820:30
IAD
-
BFS
2 stops18h 45m
Multiple Airlines
Deal found 4/5£725
Tue 23/606:30
BHD
-
IAD
1 stop14h 20m
American Airlines
Tue 11/822:25
IAD
-
BHD
1 stop11h 55m
American Airlines
Deal found 5/5£730
Wed 11/1111:25
BHD
-
IAD
1 stop13h 30m
British Airways
Sun 15/1116:34
IAD
-
BHD
2 stops21h 06m
British Airways
Deal found 4/5£734
Thu 21/507:00
BHD
-
IAD
3 stops42h 29m
Multiple Airlines
Mon 25/509:55
IAD
-
BHD
3 stops25h 35m
Multiple Airlines
Deal found 5/5£802
Tue 16/620:10
BFS
-
IAD
3 stops29h 19m
Multiple Airlines
Tue 23/608:18
IAD
-
BFS
3 stops25h 57m
Multiple Airlines
Deal found 2/5£808
Fri 15/521:00
BFS
-
IAD
2 stops23h 45m
Multiple Airlines
Sun 17/517:15
IAD
-
BFS
2 stops15h 00m
Multiple Airlines
Deal found 2/5£837
Tue 23/609:40
BHD
-
IAD
1 stop11h 10m
British Airways
Tue 11/817:45
IAD
-
BHD
1 stop12h 00m
British Airways
Deal found 4/5£841
Thu 18/620:05
BFS
-
IAD
2 stops29h 35m
Multiple Airlines
Thu 25/617:15
IAD
-
BFS
2 stops17h 40m
Multiple Airlines
Deal found 4/5£924

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 5 May 2026.

Round-trip from

£715
21/5-25/5
  • 21/5-25/5
  • 4 total stops
  • 27h 05m 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 5 May 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 - IAD

BFSIAD

Belfast Intl

Thu 21/5

06:40-15:45

2 stops14h 05m

Washington, D.C. Dulles Intl

Mon 25/5

17:15-11:15

2 stops13h 00m

£715

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Mon 24/8

20:15-15:10

3 stops47h 55m

Washington, D.C. Dulles Intl

Sat 29/8

20:30-20:15

2 stops18h 45m

£725

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Tue 23/6

06:30-15:50

1 stop14h 20m

Washington, D.C. Dulles Intl

Tue 11/8

10:27-10:45

2 stops19h 18m

£730

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Thu 21/5

07:00-15:45

2 stops13h 45m

Washington, D.C. Dulles Intl

Mon 25/5

17:15-16:30

2 stops18h 15m

£734

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Tue 16/6

20:10-20:29

3 stops29h 19m

Washington, D.C. Dulles Intl

Tue 23/6

08:18-15:15

3 stops25h 57m

£808

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Fri 15/5

21:00-15:45

2 stops23h 45m

Washington, D.C. Dulles Intl

Sun 17/5

17:15-13:15

2 stops15h 00m

£837
Fastest return journey

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Tue 23/6

09:40-15:50

1 stop11h 10m

Washington, D.C. Dulles Intl

Tue 11/8

21:30-15:20

1 stop12h 50m

£841

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Fri 15/5

07:00-20:29

2 stops18h 29m

Washington, D.C. Dulles Intl

Sun 17/5

08:19-14:55

2 stops25h 36m

£892

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Thu 18/6

20:05-19:00

3 stops27h 55m

Washington, D.C. Dulles Intl

Thu 25/6

17:15-15:55

2 stops17h 40m

£950

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Thu 18/6

06:30-17:30

1 stop16h 00m

Washington, D.C. Dulles Intl

Thu 25/6

17:40-18:45

1 stop20h 05m

£1,005

Flights are sorted by cheapest return flights first.

Deals found on 5/5

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 American Airlines fly from Belfast to Washington, D.C. Dulles Intl Airport in about 14h 20m. 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
Arlington
Alexandria
Sterling

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 Intl to Dulles Intl flights
Belfast City to Baltimore flights
Belfast City to Reagan-National 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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.