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Cheap flights from Washington, D.C. Dulles Intl Airport to Belfast from £265

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 11/9. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — BHD
9 Jul — 16 Jul1
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 9 June 2026.

Sat 18/720:30
IAD
-
BFS
2 stops19h 10m
Multiple Airlines
Fri 31/719:55
BFS
-
IAD
2 stops24h 50m
Multiple Airlines
Deal found 6/6£682
Sun 13/919:15
IAD
-
BHD
1 stop10h 15m
British Airways
Sun 20/911:00
BHD
-
IAD
1 stop11h 25m
British Airways
Deal found 5/6£689
Thu 23/720:30
IAD
-
BFS
2 stops20h 10m
Multiple Airlines
Sun 26/707:00
BFS
-
IAD
3 stops37h 10m
Multiple Airlines
Deal found 7/6£722
Wed 15/716:20
IAD
-
BFS
2 stops21h 55m
Multiple Airlines
Wed 22/708:50
BFS
-
IAD
3 stops35h 20m
Multiple Airlines
Deal found 4/6£726
Mon 5/1017:45
IAD
-
BHD
1 stop14h 10m
British Airways
Thu 8/1009:35
BHD
-
IAD
1 stop15h 45m
British Airways
Deal found 8/6£733
Thu 23/720:30
IAD
-
BFS
2 stops20h 10m
Multiple Airlines
Thu 30/706:40
BFS
-
IAD
2 stops18h 44m
Multiple Airlines
Deal found 4/6£734
Sat 18/720:30
IAD
-
BHD
2 stops19h 35m
Multiple Airlines
Fri 31/719:10
BHD
-
IAD
2 stops25h 35m
Multiple Airlines
Deal found 6/6£737
Sun 13/1218:20
IAD
-
BHD
1 stop11h 00m
British Airways
Sat 16/111:35
BHD
-
IAD
1 stop13h 20m
British Airways
Deal found 5/6£739
Wed 8/709:55
IAD
-
BFS
2 stops28h 20m
Multiple Airlines
Wed 15/705:55
BFS
-
IAD
2 stops19h 29m
Multiple Airlines
Deal found 8/6£743
Fri 11/917:45
IAD
-
BHD
1 stop19h 25m
British Airways
Wed 16/910:05
BHD
-
IAD
1 stop15h 15m
British Airways
Deal found 9/6£759
Thu 6/809:55
IAD
-
BFS
2 stops28h 00m
Multiple Airlines
Thu 13/822:45
BFS
-
IAD
2 stops25h 40m
Multiple Airlines
Deal found 5/6£779
Sun 16/822:25
IAD
-
BHD
1 stop14h 15m
British Airways
Sat 22/819:05
BHD
-
IAD
1 stop27h 20m
British Airways
Deal found 5/6£781

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 9 June 2026.

Round-trip from

£682

One-way from

£265
18/7-31/7
  • 18/7-31/7
  • 4 total stops
  • 44h 00m total
  • Washington, D.C. to Belfast
Search Deals
11/9
  • 11/9
  • 2 total stops
  • 40h 20m 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 9 June 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

Thu 23/7

20:30-21:40

2 stops20h 10m

Belfast Intl

Sun 26/7

07:00-15:10

3 stops37h 10m

£722

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Wed 15/7

16:20-19:15

2 stops21h 55m

Belfast Intl

Wed 22/7

08:50-15:10

3 stops35h 20m

£726

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Mon 5/10

22:25-15:30

1 stop12h 05m

Belfast City

Thu 8/10

06:30-17:25

1 stop15h 55m

£733

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sun 20/9

22:25-14:35

1 stop11h 10m

Belfast City

Thu 24/9

06:30-15:55

1 stop14h 25m

£733

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Thu 6/8

09:55-18:55

2 stops28h 00m

Belfast Intl

Thu 13/8

22:45-19:25

2 stops25h 40m

£779

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Wed 1/7

09:55-14:30

2 stops23h 35m

Belfast Intl

Tue 7/7

08:45-15:10

3 stops35h 25m

£786

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Fri 14/8

17:40-09:20

1 stop10h 40m

Belfast City

Tue 18/8

17:30-15:35

1 stop27h 05m

£795

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Sun 5/7

08:25-15:55

2 stops26h 30m

Belfast Intl

Sun 12/7

06:45-20:24

3 stops42h 39m

£800

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Wed 8/7

16:20-19:15

2 stops21h 55m

Belfast Intl

Wed 15/7

06:00-15:10

3 stops38h 10m

£810

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Thu 6/8

19:26-16:55

2 stops16h 29m

Belfast City

Thu 13/8

09:50-15:35

1 stop10h 45m

£824

Flights are sorted by cheapest return flights first.

Deals found on 7/6

Showing 1-10 of 20 resultsSorted by cheapest first
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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 £795, British Airways can have you in Belfast from Washington, D.C. Dulles Intl Airport in 10h 40m. 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

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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

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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.

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