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Cheap flights from Washington, D.C. Dulles Intl Airport to Belfast from £262

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 4/8. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — BHD
11 Jun — 18 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 12 May 2026.

Fri 15/522:25
IAD
-
BHD
1 stop14h 45m
British Airways
Tue 19/509:40
BHD
-
IAD
1 stop11h 05m
British Airways
Deal found 10/5£648
Fri 5/616:05
IAD
-
BFS
2 stops19h 25m
Multiple Airlines
Wed 10/608:30
BFS
-
IAD
3 stops41h 05m
Multiple Airlines
Deal found 10/5£677
Sun 25/1009:45
IAD
-
BFS
3 stops30h 20m
Multiple Airlines
Sun 1/1120:00
BFS
-
IAD
3 stops27h 45m
Multiple Airlines
Deal found 10/5£692
Sun 19/720:30
IAD
-
BFS
2 stops20h 00m
Multiple Airlines
Thu 23/706:20
BFS
-
IAD
3 stops38h 25m
Multiple Airlines
Deal found 8/5£693
Thu 11/611:30
IAD
-
BFS
3 stops26h 25m
Multiple Airlines
Wed 17/605:55
BFS
-
IAD
2 stops19h 34m
Multiple Airlines
Deal found 11/5£705
Mon 7/922:25
IAD
-
BHD
1 stop12h 05m
British Airways
Fri 11/909:35
BHD
-
IAD
1 stop12h 50m
British Airways
Deal found 7/5£719
Thu 3/917:45
IAD
-
BHD
1 stop11h 25m
British Airways
Tue 8/909:40
BHD
-
IAD
1 stop15h 00m
British Airways
Deal found 11/5£739
Sun 7/608:25
IAD
-
BHD
2 stops22h 30m
Multiple Airlines
Sun 14/607:00
BHD
-
IAD
3 stops37h 21m
Multiple Airlines
Deal found 10/5£751
Sun 25/1022:45
IAD
-
BHD
1 stop14h 05m
British Airways
Sun 1/1109:10
BHD
-
IAD
1 stop11h 25m
British Airways
Deal found 10/5£753
Sun 19/720:30
IAD
-
BHD
2 stops19h 35m
Multiple Airlines
Thu 23/707:00
BHD
-
IAD
3 stops37h 01m
Multiple Airlines
Deal found 8/5£767
Sat 5/919:59
IAD
-
BHD
2 stops15h 56m
Multiple Airlines
Wed 9/917:30
BHD
-
IAD
1 stop27h 05m
Multiple Airlines
Deal found 11/5£774
Thu 11/617:40
IAD
-
BHD
1 stop11h 30m
British Airways
Thu 18/606:30
BHD
-
IAD
1 stop14h 20m
British Airways
Deal found 11/5£780

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 12 May 2026.

Round-trip from

£677

One-way from

£262
5/6-10/6
  • 5/6-10/6
  • 5 total stops
  • 60h 30m total
  • Washington, D.C. to Belfast
Search Deals
4/8
  • 4/8
  • 3 total stops
  • 42h 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 12 May 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

Fri 5/6

16:05-16:30

2 stops19h 25m

Belfast Intl

Wed 10/6

08:30-20:35

3 stops41h 05m

£677

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Sun 25/10

16:30-20:05

2 stops23h 35m

Belfast Intl

Sun 1/11

20:00-18:45

3 stops27h 45m

£693
Fastest return journey

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Mon 7/9

22:25-15:30

1 stop12h 05m

Belfast City

Fri 11/9

09:35-17:25

1 stop12h 50m

£719

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Sun 19/7

09:45-18:25

3 stops27h 40m

Belfast Intl

Thu 23/7

06:20-15:45

3 stops38h 25m

£740

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Thu 11/6

17:40-10:10

1 stop11h 30m

Belfast City

Thu 18/6

06:30-15:50

1 stop14h 20m

£780

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Sun 7/6

17:15-18:25

2 stops20h 10m

Belfast Intl

Sun 14/6

16:30-15:10

2 stops27h 40m

£781

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Sun 7/6

23:20-20:15

2 stops15h 55m

Belfast Intl

Thu 11/6

06:10-19:20

2 stops18h 10m

£812

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Sat 6/6

20:30-22:15

2 stops20h 45m

Belfast Intl

Fri 12/6

18:35-19:20

2 stops29h 45m

£813

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sun 7/6

17:15-14:55

2 stops16h 40m

Belfast City

Thu 11/6

07:00-20:29

3 stops42h 29m

£821

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Thu 11/6

16:05-16:00

2 stops18h 55m

Belfast Intl

Wed 17/6

05:55-21:26

2 stops20h 31m

£838

Flights are sorted by cheapest return flights first.

Deals found on 10/5

Showing 1-10 of 31 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 £719, British Airways can have you in Belfast from Washington, D.C. Dulles Intl Airport in 12h 05m. 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

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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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