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Cheap flights from Belfast to Washington, D.C. Dulles Intl Airport from £335

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 21/11. Fares are subject to change and may not be available on all flights or dates of travel.
BHD — IAD
6 Dec — 13 Dec1
1 adult
1 adult, Economy, 0 bags

Cheap 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 6 November 2025.

Round-trip from

£542

One-way from

£335
3/12-10/12
  • 3/12-10/12
  • 5 total stops
  • 53h 55m total
  • Belfast to Washington, D.C.
Search Deals
21/11
  • 21/11
  • 2 total stops
  • 29h 25m total
  • Belfast to Washington, D.C.
Search Deals

Find 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 6 November 2025.

Wed 3/1207:10BFS - IAD
3 stops37h 05mMultiple Airlines
Wed 10/1222:30IAD - BFS
2 stops16h 50mMultiple Airlines
Deal found 5/11£542
Wed 3/1214:15BHD - IAD
3 stops30h 00mMultiple Airlines
Wed 10/1222:30IAD - BHD
2 stops17h 20mMultiple Airlines
Deal found 5/11£548
Thu 11/1221:00BFS - IAD
3 stops47h 15mMultiple Airlines
Sun 14/1222:30IAD - BFS
2 stops15h 25mMultiple Airlines
Deal found 4/11£580
Thu 13/1107:05BFS - IAD
2 stops16h 25mMultiple Airlines
Mon 17/1119:40IAD - BFS
2 stops18h 25mMultiple Airlines
Deal found 3/11£608
Thu 13/1107:00BHD - IAD
2 stops16h 30mMultiple Airlines
Mon 17/1119:40IAD - BHD
2 stops20h 10mMultiple Airlines
Deal found 3/11£646
Thu 11/1207:25BHD - IAD
2 stops16h 05mMultiple Airlines
Sun 14/1219:40IAD - BHD
2 stops19h 50mMultiple Airlines
Deal found 4/11£661
Wed 3/1206:30BHD - IAD
1 stop14h 35mVirgin Atlantic
Wed 10/1218:05IAD - BHD
1 stop21h 55mVirgin Atlantic
Deal found 5/11£702
Thu 20/1111:05BHD - IAD
1 stop13h 50mAmerican Airlines
Mon 24/1117:29IAD - BHD
2 stops15h 46mAmerican Airlines
Deal found 5/11£745
Wed 19/1106:35BHD - IAD
1 stop18h 20mBritish Airways
Sun 23/1113:58IAD - BHD
2 stops15h 22mBritish Airways
Deal found 5/11£749
Thu 20/1115:05BHD - IAD
1 stop29h 30mBritish Airways
Mon 24/1121:45IAD - BHD
1 stop11h 30mBritish Airways
Deal found 3/11£753
Thu 11/1209:05BHD - IAD
1 stop15h 50mBritish Airways
Sun 14/1218:20IAD - BHD
1 stop11h 00mBritish Airways
Deal found 4/11£753

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 6 November 2025.
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

Belfast

Fly to

Dulles Intl

Route

Depart

Return

Price

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Wed 3/12

07:10-15:15

3 stops37h 05m

Washington, D.C. Dulles Intl

Wed 10/12

22:30-20:20

2 stops16h 50m

£542

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Thu 11/12

21:00-15:15

3 stops47h 15m

Washington, D.C. Dulles Intl

Sun 14/12

22:30-18:55

2 stops15h 25m

£580

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Wed 3/12

14:15-15:15

3 stops30h 00m

Washington, D.C. Dulles Intl

Wed 10/12

21:45-19:20

1 stop16h 35m

£645

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Thu 11/12

07:25-18:30

2 stops16h 05m

Washington, D.C. Dulles Intl

Sun 14/12

19:40-20:30

2 stops19h 50m

£661

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Wed 3/12

06:30-16:05

1 stop14h 35m

Washington, D.C. Dulles Intl

Wed 10/12

17:03-16:50

2 stops18h 47m

£702

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Wed 3/12

06:30-16:05

1 stop14h 35m

Washington, D.C. Dulles Intl

Wed 10/12

18:05-21:00

1 stop21h 55m

£702

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Thu 20/11

06:35-15:35

1 stop14h 00m

Washington, D.C. Dulles Intl

Mon 24/11

21:45-16:05

1 stop13h 20m

£745

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Wed 19/11

06:35-19:55

1 stop18h 20m

Washington, D.C. Dulles Intl

Sun 23/11

13:58-10:20

2 stops15h 22m

£749

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Thu 20/11

11:05-19:55

1 stop13h 50m

Washington, D.C. Dulles Intl

Mon 24/11

21:45-14:15

1 stop11h 30m

£749

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Fri 21/11

07:20-07:45

2 stops29h 25m

£335

Flights are sorted by cheapest return flights first.

Deals found on 3/11

Showing 1-10 of 20 results
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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

What is the cheapest time of day to fly from BFS to IAD?

Find hourly flight availability from Belfast to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 6 November 2025.

When flying from Belfast to Washington, D.C. Dulles Intl Airport, 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 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 Delta, Virgin Atlantic, and American Airlines fly from Belfast to Washington, D.C. Dulles Intl Airport in about 14h. The time it takes to get you to your destination can typically vary by up to 35m. 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
Hanover
Oxon Hill
Woodbridge
Arlington
Alexandria
College Park

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