Find flights
When to book
FAQs

Cheap flights from Washington, D.C. Dulles Intl Airport to Belfast from £255

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 10/5. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — BHD
28 Apr — 5 May1
1 adult
1 adult, Economy, 0 bags

Cheap 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 29 March 2026.

Sun 10/520:30
IAD
-
BFS
2 stops20h 00m
Multiple Airlines
Sun 17/520:20
BFS
-
IAD
3 stops47h 50m
Multiple Airlines
Deal found 26/3£547
Sat 9/520:30
IAD
-
BFS
2 stops19h 10m
Multiple Airlines
Sat 16/507:40
BFS
-
IAD
3 stops35h 35m
Multiple Airlines
Deal found 25/3£572
Wed 13/509:55
IAD
-
BFS
2 stops26h 10m
Multiple Airlines
Wed 20/508:20
BFS
-
IAD
3 stops41h 15m
Multiple Airlines
Deal found 29/3£626
Tue 25/820:30
IAD
-
BFS
2 stops20h 45m
Multiple Airlines
Sun 6/920:20
BFS
-
IAD
3 stops47h 50m
Multiple Airlines
Deal found 28/3£682
Wed 2/921:30
IAD
-
BHD
1 stop11h 05m
British Airways
Fri 11/906:30
BHD
-
IAD
1 stop15h 55m
British Airways
Deal found 24/3£683
Mon 28/917:40
IAD
-
BHD
1 stop14h 15m
British Airways
Fri 2/1006:30
BHD
-
IAD
1 stop15h 55m
British Airways
Deal found 25/3£698
Sun 24/515:45
IAD
-
BFS
3 stops22h 05m
Multiple Airlines
Mon 25/521:05
BFS
-
IAD
3 stops47h 05m
Multiple Airlines
Deal found 28/3£711
Fri 25/920:30
IAD
-
BFS
3 stops21h 50m
Multiple Airlines
Sun 4/1007:00
BFS
-
IAD
3 stops41h 00m
Multiple Airlines
Deal found 25/3£714
Sat 11/420:30
IAD
-
BFS
2 stops20h 00m
Multiple Airlines
Tue 14/408:50
BFS
-
IAD
3 stops40h 45m
Multiple Airlines
Deal found 28/3£715
Fri 2/1022:25
IAD
-
BHD
1 stop14h 45m
British Airways
Tue 13/1009:40
BHD
-
IAD
1 stop12h 45m
British Airways
Deal found 24/3£719
Wed 2/921:30
IAD
-
BHD
1 stop13h 10m
British Airways
Mon 12/1019:35
BHD
-
IAD
1 stop26h 50m
British Airways
Deal found 28/3£732
Wed 2/921:30
IAD
-
BHD
1 stop11h 05m
British Airways
Sun 6/906:30
BHD
-
IAD
1 stop15h 55m
British Airways
Deal found 25/3£736

Find 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 29 March 2026.

Round-trip from

£547

One-way from

£255
10/5-17/5
  • 10/5-17/5
  • 5 total stops
  • 67h 50m total
  • Washington, D.C. to Belfast
Search Deals
10/5
  • 10/5
  • 2 total stops
  • 20h 00m total
  • Washington, D.C. to Belfast
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 29 March 2026.
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

Fly to

Route

Depart

Return

Price

Cheapest return flight

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Sat 9/5

20:30-20:40

2 stops19h 10m

Belfast Intl

Sat 16/5

07:40-14:15

3 stops35h 35m

£572

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Wed 13/5

09:55-17:05

2 stops26h 10m

Belfast Intl

Wed 20/5

08:20-20:35

3 stops41h 15m

£626

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Sun 10/5

20:30-21:30

2 stops20h 00m

Belfast Intl

Sun 17/5

06:20-19:00

2 stops17h 40m

£680

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Sat 11/4

20:30-21:30

2 stops20h 00m

Belfast Intl

Tue 14/4

08:50-20:35

3 stops40h 45m

£715

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Sun 24/5

17:15-17:35

2 stops19h 20m

Belfast Intl

Mon 25/5

21:05-15:10

3 stops47h 05m

£728

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Wed 2/9

21:30-13:35

1 stop11h 05m

Belfast City

Sun 6/9

06:30-17:25

1 stop15h 55m

£736

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Wed 2/9

12:30-09:20

2 stops15h 50m

Belfast City

Fri 11/9

09:50-15:35

1 stop10h 45m

£754

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Fri 4/9

12:30-16:55

2 stops23h 25m

Belfast City

Tue 15/9

09:50-15:35

1 stop10h 45m

£792

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Fri 14/8

20:30-23:20

3 stops21h 50m

Belfast Intl

Sun 23/8

16:30-15:10

2 stops27h 40m

£795
Fastest return journey

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sat 15/8

13:00-09:20

2 stops15h 20m

Belfast City

Sat 22/8

09:50-15:35

1 stop10h 45m

£840

Flights are sorted by cheapest return flights first.

Deals found on 26/3

Showing 1-10 of 21 resultsSorted by cheapest first
1
2
3

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 £736, British Airways can have you in Belfast from Washington, D.C. Dulles Intl Airport in 11h 05m. The distance from Washington, D.C. Dulles Intl Airport to Belfast is about 3390 mi. Both multi-stop and direct flights can be found to your destination and back.

  • 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.