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Cheap flights from Belfast to Washington, D.C. Dulles Intl Airport from £613

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/12. Fares are subject to change and may not be available on all flights or dates of travel.
BHD — IAD
4 Jan — 11 Jan1
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 December 2025.

Fri 12/1207:00BFS - IAD
3 stops40h 45mMultiple Airlines
Fri 9/122:30IAD - BFS
2 stops18h 30mMultiple Airlines
Deal found 3/12£613
Fri 12/1217:20BHD - IAD
3 stops30h 25mMultiple Airlines
Fri 9/122:30IAD - BHD
2 stops17h 20mMultiple Airlines
Deal found 3/12£851
Fri 12/1206:45BHD - IAD
1 stop13h 50mBritish Airways
Fri 9/118:20IAD - BHD
1 stop11h 10mBritish Airways
Deal found 3/12£1,072

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 December 2025.

Round-trip from

£726
British Airways
  • British Airways
  • 22/1-26/1
  • 3 total stops
  • 33h 09m total
  • Belfast to Washington, D.C.
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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 December 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 22/1

09:05-19:55

1 stop15h 50m

Washington, D.C. Dulles Intl

Mon 26/1

17:46-16:05

2 stops17h 19m

£726

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Thu 29/1

09:05-15:35

1 stop11h 30m

Washington, D.C. Dulles Intl

Mon 2/2

13:08-10:40

2 stops16h 32m

£731

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Thu 5/2

09:05-19:55

1 stop15h 50m

Washington, D.C. Dulles Intl

Mon 9/2

17:46-16:05

2 stops17h 19m

£731

Flights are sorted by cheapest return flights first.

Deals found on 2/12

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 5 December 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 British Airways fly from Belfast to Washington, D.C. Dulles Intl Airport in about 15h 50m. 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
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 Reagan-National flights
Belfast Intl to Baltimore flights
Belfast Intl to Dulles Intl flights
Belfast City to Baltimore 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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