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Cheap flights from Washington, D.C. Dulles Intl Airport to Belfast from £234

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
25 Jun — 2 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 26 May 2026.

Fri 21/820:30
IAD
-
BFS
2 stops20h 20m
Multiple Airlines
Tue 25/807:35
BFS
-
IAD
3 stops36h 35m
Multiple Airlines
Deal found 23/5£617
Fri 11/920:30
IAD
-
BFS
2 stops20h 20m
Multiple Airlines
Sun 8/1107:30
BFS
-
IAD
3 stops40h 15m
Multiple Airlines
Deal found 23/5£626
Mon 7/920:30
IAD
-
BFS
2 stops19h 10m
Multiple Airlines
Sun 13/906:25
BFS
-
IAD
3 stops37h 45m
Multiple Airlines
Deal found 26/5£645
Sat 12/920:30
IAD
-
BFS
2 stops19h 55m
Multiple Airlines
Mon 21/909:15
BFS
-
IAD
3 stops40h 20m
Multiple Airlines
Deal found 22/5£651
Tue 8/909:55
IAD
-
BFS
2 stops28h 45m
Multiple Airlines
Fri 18/908:55
BFS
-
IAD
3 stops40h 10m
Multiple Airlines
Deal found 25/5£657
Tue 13/1020:30
IAD
-
BFS
2 stops13h 45m
Multiple Airlines
Wed 11/1107:55
BFS
-
IAD
3 stops36h 20m
Multiple Airlines
Deal found 22/5£663
Tue 13/1017:45
IAD
-
BHD
1 stop10h 15m
British Airways
Wed 11/1112:25
BHD
-
IAD
1 stop12h 30m
British Airways
Deal found 22/5£708
Sun 11/1022:25
IAD
-
BHD
1 stop11h 10m
British Airways
Mon 9/1119:25
BHD
-
IAD
1 stop25h 10m
British Airways
Deal found 22/5£724
Sun 13/922:25
IAD
-
BHD
1 stop14h 15m
British Airways
Wed 16/920:35
BHD
-
IAD
1 stop25h 50m
British Airways
Deal found 25/5£725
Tue 8/917:45
IAD
-
BHD
1 stop12h 00m
British Airways
Fri 18/909:35
BHD
-
IAD
1 stop12h 50m
British Airways
Deal found 25/5£729
Tue 8/912:30
IAD
-
BHD
2 stops15h 50m
KLM
Fri 18/909:50
BHD
-
IAD
1 stop10h 45m
KLM
Deal found 25/5£742
Sun 19/720:30
IAD
-
BFS
2 stops20h 00m
Multiple Airlines
Wed 29/705:55
BFS
-
IAD
3 stops38h 06m
Multiple Airlines
Deal found 24/5£742

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 26 May 2026.

Round-trip from

£617

One-way from

£234
21/8-25/8
  • 21/8-25/8
  • 5 total stops
  • 56h 55m total
  • Washington, D.C. to Belfast
Search Deals
11/9
  • 11/9
  • 2 total stops
  • 25h 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 26 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 11/9

20:30-21:50

2 stops20h 20m

Belfast Intl

Sun 8/11

07:30-18:45

3 stops40h 15m

£626

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Mon 7/9

20:30-20:40

2 stops19h 10m

Belfast Intl

Sun 13/9

06:25-15:10

3 stops37h 45m

£645

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Sat 12/9

20:30-21:25

2 stops19h 55m

Belfast Intl

Mon 21/9

09:15-20:35

3 stops40h 20m

£651

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Tue 13/10

20:30-15:15

2 stops13h 45m

Belfast Intl

Wed 11/11

07:55-15:15

3 stops36h 20m

£663

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sun 11/10

19:15-14:35

1 stop14h 20m

Belfast City

Tue 10/11

06:35-15:35

1 stop14h 00m

£724

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Tue 13/10

17:45-09:00

1 stop10h 15m

Belfast City

Thu 12/11

06:35-15:35

1 stop14h 00m

£724

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sun 13/9

22:25-14:35

1 stop11h 10m

Belfast City

Wed 16/9

19:40-17:25

1 stop26h 45m

£724
Fastest return journey

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Wed 14/10

19:15-12:00

1 stop11h 45m

Belfast City

Wed 11/11

09:15-15:35

1 stop11h 20m

£724

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Mon 12/10

22:25-15:30

1 stop12h 05m

Belfast City

Tue 10/11

08:45-15:35

1 stop11h 50m

£724

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Sun 19/7

20:30-21:30

2 stops20h 00m

Belfast Intl

Wed 29/7

05:55-15:01

3 stops38h 06m

£742

Flights are sorted by cheapest return flights first.

Deals found on 23/5

Showing 1-10 of 23 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 £724, British Airways can have you in Belfast from Washington, D.C. Dulles Intl Airport in 14h 20m. 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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