Find flights
When to book
FAQs

Cheap flights from Washington, D.C. Dulles Intl Airport to Belfast from £479

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 16/3. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — BHD
27 Nov — 4 Dec1
1 adult
1 adult, Economy, 0 bags

Find flight deals from Dulles Intl to Belfast

Enter your travel dates to find the best prices.

Cheapest flights from Dulles Intl to Belfast
Explore the most affordable flight options available from Dulles Intl to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 October 2025.

Wed 12/1118:05IAD - BHD
1 stop17h 45mDelta
Sun 16/1106:30BHD - IAD
1 stop14h 35mDelta
Deal found 27/10£491
Wed 3/1219:40IAD - BHD
2 stops20h 10mMultiple Airlines
Wed 10/1207:00BHD - IAD
2 stops16h 30mMultiple Airlines
Deal found 27/10£493
Thu 30/1019:05IAD - BHD
1 stop17h 45mDelta
Mon 3/1106:30BHD - IAD
2 stops21h 49mDelta
Deal found 26/10£499
Wed 10/1219:40IAD - BFS
2 stops20h 00mMultiple Airlines
Wed 17/1207:20BFS - IAD
2 stops16h 10mMultiple Airlines
Deal found 26/10£500
Wed 12/1112:11IAD - BHD
2 stops27h 49mVirgin Atlantic
Sun 16/1106:30BHD - IAD
2 stops21h 33mVirgin Atlantic
Deal found 26/10£502
Tue 30/1218:05IAD - BHD
1 stop17h 45mVirgin Atlantic
Wed 7/117:20BHD - IAD
1 stop27h 45mVirgin Atlantic
Deal found 26/10£507
Thu 11/1220:30IAD - BFS
2 stops15h 30mMultiple Airlines
Thu 18/1207:30BFS - IAD
2 stops17h 35mMultiple Airlines
Deal found 27/10£519
Tue 30/1217:29IAD - BHD
2 stops18h 21mDelta
Wed 7/117:20BHD - IAD
2 stops30h 49mDelta
Deal found 26/10£532
Sat 6/1209:45IAD - BFS
2 stops20h 10mMultiple Airlines
Fri 12/1214:20BFS - IAD
2 stops31h 20mMultiple Airlines
Deal found 26/10£542
Tue 25/1118:05IAD - BHD
1 stop17h 45mMultiple Airlines
Mon 1/1217:20BHD - IAD
1 stop27h 45mMultiple Airlines
Deal found 25/10£566
Sat 6/1218:20IAD - BHD
1 stop9h 50mBritish Airways
Fri 12/1219:35BHD - IAD
2 stops33h 26mBritish Airways
Deal found 26/10£576
Sat 6/1219:40IAD - BHD
2 stops17h 55mMultiple Airlines
Fri 12/1207:20BHD - IAD
2 stops16h 10mMultiple Airlines
Deal found 26/10£600

Cheap flight deals from Dulles Intl to Belfast

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Belfast (BF1). 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 28 October 2025.

Round-trip from

£473

Popular in

June

Cheapest in

February
British Airways
  • British Airways
  • 3/12-10/12
  • 2 total stops
  • 23h 20m total
  • Washington, D.C. to Belfast
Search Deals
Highest demand for flights based on searches. 18% potential increase in price (£103 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£25 potential savings vs. average return price).
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Dulles Intl to Belfast 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 28 October 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Belfast that are best for you.

Fly from

Dulles Intl

Fly to

Belfast

Route

Depart

Return

Price

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Mon 16/3

22:45-14:15

1 stop11h 30m

Belfast City

Sun 22/3

09:10-16:40

1 stop11h 30m

£479

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sat 17/1

21:45-16:45

1 stop14h 00m

Belfast City

Fri 23/1

19:35-15:35

1 stop25h 00m

£484

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Fri 16/1

21:45-17:15

1 stop14h 30m

Belfast City

Thu 22/1

17:45-15:35

1 stop26h 50m

£484

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Fri 16/1

21:45-14:15

1 stop11h 30m

Belfast City

Fri 23/1

08:45-19:55

1 stop16h 10m

£484

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Mon 19/1

21:45-16:05

1 stop13h 20m

Belfast City

Tue 27/1

10:00-19:55

1 stop14h 55m

£484

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Fri 16/1

21:45-17:15

1 stop14h 30m

Belfast City

Wed 21/1

11:25-19:55

1 stop13h 30m

£484

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Tue 13/1

18:20-10:30

1 stop11h 10m

Belfast City

Thu 22/1

11:05-19:55

1 stop13h 50m

£484

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Tue 13/1

21:45-14:50

1 stop12h 05m

Belfast City

Tue 27/1

06:35-15:35

1 stop14h 00m

£484

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Mon 19/1

21:45-16:05

1 stop13h 20m

Belfast City

Sun 25/1

17:35-15:35

1 stop27h 00m

£484

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Fri 16/1

21:45-17:15

1 stop14h 30m

Belfast City

Mon 26/1

11:30-19:55

1 stop13h 25m

£484

Flights are sorted by cheapest return flights first.

Deals found on 27/10

Showing 1-10 of 18 results
1
2

Best time to book a flight from Dulles Intl to Belfast

Have a flexible travel schedule? Discover the best time to fly to Belfast from Dulles Intl 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 Washington, D.C. Dulles Intl Airport to Belfast
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 Dulles Intl to Belfast. 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 Washington, D.C. Dulles Intl Airport to Belfast?

    For as low as £479, British Airways can have you in Belfast from Washington, D.C. Dulles Intl Airport in 11h 30m. The distance from Washington, D.C. Dulles Intl Airport to Belfast is about 3390 mi.

  • Can I find deals for flights from Dulles Intl to Belfast that include hotel bookings?

    Yes. In addition to deals on Dulles Intl to Belfast flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Dulles Intl to Belfast?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to Belfast.

  • Can I find deals for business class flights from Dulles Intl to Belfast?

    Yes. Cheapflights offers flight deals from Dulles Intl to Belfast 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

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.

Complete your trip

Complete your trip to Belfast by adding a car hire and/or hotel booking to your travel itinerary.
Belfast car hire
Belfast Intl Airport car hire
Londonderry Eglinton Airport car hire
Isle of Islay Glenegedale Airport car hire
Londonderry car hire

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 Dulles Intl to Belfast?

Deals for Dulles Intl to Belfast flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Dulles Intl to Belfast?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Dulles Intl to Belfast.

Can Cheapflights find flights from Dulles Intl to Belfast with no change fees?

Need flexible booking options for your flight to Belfast from Dulles Intl? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Dulles Intl to Belfast become cheaper?

Not ready to book yet? You can track prices for flights from Dulles Intl to Belfast on Cheapflights with our Price Alert feature and get notified when better prices are available.

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.