Find flights
When to book
FAQs

Cheap flights from Washington, D.C. Dulles Intl Airport to Belfast from £270

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 13/9. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — BHD
28 May — 4 Jun1
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 28 April 2026.

Mon 24/820:30
IAD
-
BFS
2 stops20h 45m
Multiple Airlines
Mon 31/808:40
BFS
-
IAD
3 stops35h 30m
Multiple Airlines
Deal found 26/4£609
Sun 31/508:25
IAD
-
BFS
2 stops31h 35m
Multiple Airlines
Wed 10/620:15
BFS
-
IAD
3 stops47h 55m
Multiple Airlines
Deal found 24/4£617
Mon 11/520:30
IAD
-
BFS
2 stops19h 10m
Multiple Airlines
Thu 14/509:15
BFS
-
IAD
3 stops34h 55m
Multiple Airlines
Deal found 27/4£634
Mon 14/920:30
IAD
-
BFS
3 stops21h 50m
Multiple Airlines
Wed 23/908:30
BFS
-
IAD
3 stops35h 40m
Multiple Airlines
Deal found 25/4£638
Fri 11/923:20
IAD
-
BFS
2 stops17h 30m
Multiple Airlines
Wed 16/920:10
BFS
-
IAD
3 stops47h 15m
Multiple Airlines
Deal found 26/4£665
Mon 1/612:40
IAD
-
BFS
2 stops18h 50m
Multiple Airlines
Sun 7/609:35
BFS
-
IAD
3 stops34h 35m
Multiple Airlines
Deal found 24/4£676
Tue 9/608:18
IAD
-
BFS
3 stops27h 02m
Multiple Airlines
Tue 16/622:30
BFS
-
IAD
3 stops25h 30m
Multiple Airlines
Deal found 25/4£676
Mon 14/919:15
IAD
-
BHD
1 stop12h 40m
British Airways
Wed 23/911:35
BHD
-
IAD
1 stop13h 45m
British Airways
Deal found 25/4£706
Mon 24/819:15
IAD
-
BHD
1 stop12h 40m
British Airways
Mon 31/819:35
BHD
-
IAD
1 stop29h 05m
British Airways
Deal found 26/4£719
Sun 15/1121:45
IAD
-
BHD
1 stop11h 10m
British Airways
Thu 19/1109:05
BHD
-
IAD
1 stop15h 50m
British Airways
Deal found 26/4£723
Mon 14/918:10
IAD
-
BHD
1 stop10h 10m
Virgin Atlantic
Wed 23/909:50
BHD
-
IAD
2 stops19h 20m
Virgin Atlantic
Deal found 25/4£744
Fri 11/917:45
IAD
-
BHD
1 stop19h 25m
British Airways
Wed 16/910:05
BHD
-
IAD
1 stop14h 35m
British Airways
Deal found 26/4£749

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 28 April 2026.

Round-trip from

£609

One-way from

£270
24/8-31/8
  • 24/8-31/8
  • 5 total stops
  • 56h 15m total
  • Washington, D.C. to Belfast
Search Deals
British Airways
  • British Airways
  • 13/9
  • 1 total stop
  • 11h 45m 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 28 April 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

Mon 11/5

20:30-20:40

2 stops19h 10m

Belfast Intl

Thu 14/5

09:15-15:10

3 stops34h 55m

£634

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Mon 14/9

20:30-23:20

3 stops21h 50m

Belfast Intl

Wed 23/9

08:30-15:10

3 stops35h 40m

£638

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Fri 11/9

23:20-21:50

2 stops17h 30m

Belfast Intl

Wed 16/9

20:10-14:25

3 stops47h 15m

£665

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Tue 9/6

12:40-16:20

2 stops22h 40m

Belfast Intl

Tue 16/6

22:30-19:00

3 stops25h 30m

£682
Fastest return journey

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Mon 14/9

18:10-09:20

1 stop10h 10m

Belfast City

Wed 23/9

09:50-00:10

2 stops19h 20m

£744

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sun 20/9

22:25-14:35

1 stop11h 10m

Belfast City

Sat 26/9

19:05-17:25

1 stop27h 20m

£756

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Sun 14/6

20:30-21:50

2 stops20h 20m

Belfast Intl

Fri 19/6

07:05-19:20

2 stops17h 15m

£768

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Mon 24/8

18:10-16:55

1 stop17h 45m

Belfast City

Mon 31/8

09:50-00:10

2 stops19h 20m

£786

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Mon 11/5

20:30-20:15

2 stops18h 45m

Belfast Intl

Fri 15/5

06:05-22:15

2 stops21h 10m

£794

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sun 20/9

20:30-17:20

2 stops15h 50m

Belfast City

Sat 26/9

07:00-15:16

3 stops37h 16m

£813

Flights are sorted by cheapest return flights first.

Deals found on 24/4

Showing 1-10 of 34 resultsSorted by cheapest first
1
2
3
4

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 £744, Virgin Atlantic can have you in Belfast from Washington, D.C. Dulles Intl Airport in 10h 10m. 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.