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Cheap flights from Washington, D.C. Dulles Intl Airport to Belfast from £432

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/3. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — BHD
27 Feb — 6 Mar1
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 January 2026.

Wed 11/320:40
IAD
-
BFS
2 stops15h 30m
Multiple Airlines
Wed 18/307:55
BFS
-
IAD
2 stops15h 35m
Multiple Airlines
Deal found 26/1£432
Wed 4/318:20
IAD
-
BHD
1 stop9h 50m
British Airways
Sun 8/312:10
BHD
-
IAD
1 stop12h 45m
British Airways
Deal found 25/1£471
Thu 5/321:45
IAD
-
BHD
1 stop16h 05m
British Airways
Thu 12/309:05
BHD
-
IAD
1 stop11h 30m
British Airways
Deal found 26/1£473
Tue 25/821:30
IAD
-
BHD
1 stop13h 55m
British Airways
Mon 31/811:35
BHD
-
IAD
1 stop13h 45m
British Airways
Deal found 26/1£478
Tue 25/817:40
IAD
-
BHD
1 stop12h 05m
British Airways
Tue 1/913:45
BHD
-
IAD
1 stop10h 55m
British Airways
Deal found 27/1£481
Tue 27/118:05
IAD
-
BHD
1 stop17h 45m
KLM
Sun 1/217:20
BHD
-
IAD
1 stop27h 45m
KLM
Deal found 26/1£486
Mon 26/117:26
IAD
-
BHD
2 stops18h 24m
KLM
Sun 1/217:20
BHD
-
IAD
1 stop27h 45m
KLM
Deal found 26/1£489
Thu 2/419:15
IAD
-
BHD
1 stop20h 20m
British Airways
Tue 7/420:25
BHD
-
IAD
1 stop26h 00m
British Airways
Deal found 27/1£491
Mon 26/117:26
IAD
-
BHD
2 stops18h 24m
Delta
Sun 1/217:20
BHD
-
IAD
2 stops28h 26m
Delta
Deal found 26/1£497
Tue 25/817:40
IAD
-
BHD
1 stop18h 15m
Delta
Wed 2/909:50
BHD
-
IAD
2 stops18h 39m
Delta
Deal found 26/1£504
Tue 25/819:59
IAD
-
BHD
2 stops15h 56m
Multiple Airlines
Tue 1/917:30
BHD
-
IAD
1 stop27h 05m
Multiple Airlines
Deal found 26/1£529
Tue 25/819:59
IAD
-
BHD
2 stops15h 56m
Multiple Airlines
Wed 2/909:50
BHD
-
IAD
2 stops18h 39m
Multiple Airlines
Deal found 26/1£536

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 January 2026.

Round-trip from

£398
11/3-18/3
  • 11/3-18/3
  • 4 total stops
  • 38h 40m 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 January 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

Dulles Intl

Fly to

Belfast

Route

Depart

Return

Price

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Wed 11/3

20:40-16:10

2 stops15h 30m

Belfast Intl

Wed 18/3

07:55-19:30

2 stops15h 35m

£432

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Wed 4/3

18:20-09:10

1 stop9h 50m

Belfast City

Sun 8/3

12:10-20:55

1 stop12h 45m

£471

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sat 9/5

19:15-12:25

1 stop12h 10m

Belfast City

Sun 17/5

06:30-17:25

1 stop15h 55m

£478

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sat 2/5

17:40-10:05

1 stop11h 25m

Belfast City

Sat 9/5

07:05-17:25

1 stop15h 20m

£481

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Thu 2/4

19:15-20:35

1 stop20h 20m

Belfast City

Tue 7/4

20:25-17:25

1 stop26h 00m

£491

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

20:25-16:35

1 stop24h 10m

£562

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Thu 2/4

17:40-09:20

1 stop10h 40m

Belfast City

Tue 7/4

09:50-20:46

2 stops15h 56m

£584

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Thu 12/3

14:30-22:35

2 stops28h 05m

Belfast Intl

Thu 19/3

14:00-12:45

2 stops26h 45m

£595

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Thu 5/3

21:45-20:30

1 stop17h 45m

Belfast City

Thu 12/3

06:35-20:30

2 stops17h 55m

£605

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sat 9/5

15:26-10:05

2 stops13h 39m

Belfast City

Sun 17/5

11:00-23:59

2 stops17h 59m

£613

Flights are sorted by cheapest return flights first.

Deals found on 26/1

Showing 1-10 of 12 results
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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 £471, British Airways can have you in Belfast from Washington, D.C. Dulles Intl Airport in 9h 50m. 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

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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

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How does Cheapflights help users find flights from Dulles Intl to Belfast?

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

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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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