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Cheap flights from Belfast to Washington, D.C. Dulles Intl Airport from £286

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 14/10. Fares are subject to change and may not be available on all flights or dates of travel.
BHD — IAD
16 Oct — 23 Oct1
1 adult
1 adult, Economy

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 16 September 2025.

Round-trip from

£494

One-way from

£286
American Airlines
  • American Airlines
  • 20/11-24/11
  • 3 total stops
  • 35h 40m total
  • Belfast to Washington, D.C.
Search Deals
14/10
  • 14/10
  • 3 total stops
  • 46h 55m total
  • Belfast to Washington, D.C.
Search Deals

Find flight deals from Belfast to Dulles Intl

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 16 September 2025.

Thu 20/1111:05BHD - IAD
1 stop13h 50mAmerican Airlines
Mon 24/1111:25IAD - BHD
2 stops21h 50mAmerican Airlines
Deal found 13/9£494
Thu 9/1006:30BHD - IAD
1 stop14h 05mKLM
Thu 16/1021:20IAD - BHD
2 stops14h 35mKLM
Deal found 15/9£517
Sun 12/1006:50BHD - IAD
1 stop18h 30mMultiple Airlines
Sun 19/1013:09IAD - BHD
2 stops17h 21mMultiple Airlines
Deal found 14/9£544
Sun 12/1011:00BHD - IAD
1 stop14h 20mBritish Airways
Sun 19/1017:50IAD - BHD
1 stop14h 15mBritish Airways
Deal found 14/9£558
Fri 10/1006:30BHD - IAD
1 stop14h 05mKLM
Sun 12/1017:25IAD - BHD
1 stop22h 50mKLM
Deal found 15/9£568
Thu 30/1016:15BFS - IAD
3 stops33h 45mMultiple Airlines
Thu 6/1117:30IAD - BFS
2 stops23h 50mMultiple Airlines
Deal found 14/9£580
Fri 10/1006:05BFS - IAD
2 stops21h 05mMultiple Airlines
Sun 12/1020:30IAD - BFS
2 stops18h 50mMultiple Airlines
Deal found 15/9£584
Fri 10/1006:30BHD - IAD
2 stops21h 30mDelta
Sun 12/1017:25IAD - BHD
1 stop18h 30mDelta
Deal found 15/9£612
Fri 10/1007:00BHD - IAD
2 stops20h 10mMultiple Airlines
Sun 12/1020:30IAD - BHD
2 stops18h 55mMultiple Airlines
Deal found 15/9£625

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 16 September 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.

BHD - IAD

BHDIAD

Belfast City

Thu 20/11

11:05-19:55

1 stop13h 50m

Washington, D.C. Dulles Intl

Mon 24/11

18:20-10:40

1 stop11h 20m

£494

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Thu 9/10

06:30-15:35

1 stop14h 05m

Washington, D.C. Dulles Intl

Thu 16/10

17:25-21:15

1 stop22h 50m

£525

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Sun 12/10

06:50-20:20

1 stop18h 30m

Washington, D.C. Dulles Intl

Sun 19/10

13:09-11:30

2 stops17h 21m

£544

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Sun 12/10

11:00-23:53

2 stops17h 53m

Washington, D.C. Dulles Intl

Sun 19/10

17:41-14:40

2 stops15h 59m

£548

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Fri 10/10

06:30-15:35

1 stop14h 05m

Washington, D.C. Dulles Intl

Sun 12/10

17:25-21:15

1 stop22h 50m

£568

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Fri 10/10

06:05-22:10

2 stops21h 05m

Washington, D.C. Dulles Intl

Sun 12/10

20:30-20:20

2 stops18h 50m

£584

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Fri 10/10

06:30-23:00

2 stops21h 30m

Washington, D.C. Dulles Intl

Sun 12/10

17:25-16:55

1 stop18h 30m

£612

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Thu 30/10

06:30-19:30

2 stops17h 00m

Washington, D.C. Dulles Intl

Thu 6/11

19:40-22:20

2 stops21h 40m

£618

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Fri 10/10

07:00-22:10

2 stops20h 10m

Washington, D.C. Dulles Intl

Sun 12/10

20:30-20:25

2 stops18h 55m

£625

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Tue 14/10

21:25-15:20

3 stops46h 55m

£286

Flights are sorted by cheapest return flights first.

Deals found on 14/9

Showing 1-10 of 12 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 16 September 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 at midday, which can drop the price by up to 11% versus a flight in the morning.

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 and KLM fly from Belfast to Washington, D.C. Dulles Intl Airport in about 13h 50m. The time it takes to get you to your destination can typically vary by up to 15m. 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.

  • What is the cheapest month to book a flight from Belfast to Washington, D.C. Dulles Intl Airport?

    Currently, January is the cheapest month in which you can book a flight from Belfast to Washington, D.C. Dulles Intl Airport (average of £599). Flying from Belfast to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of £947). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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
College Park
Tysons

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 Intl to Dulles Intl flights
Belfast City to Dulles Intl 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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