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Cheap flights from Washington, D.C. Dulles Intl Airport to Belfast from £212

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 5/10. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — BHD
3 Sep — 10 Sep1
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 4 August 2026.

Wed 7/1019:15 -
1 stop11h 45m
Mon 12/1009:40 -
1 stop15h 40m
Deal found 2/8£564
Tue 1/923:20 -
2 stops12h 00m
Mon 7/920:15 -
3 stops47h 55m
Deal found 2/8£572
Mon 14/920:30 -
2 stops14h 45m
Mon 21/920:15 -
3 stops47h 55m
Deal found 31/7£582
Sat 17/1020:30 -
2 stops19h 55m
Thu 22/1010:25 -
3 stops47h 55m
Deal found 4/8£584
Mon 21/920:30 -
2 stops19h 00m
Tue 6/1008:05 -
3 stops39h 55m
Deal found 2/8£598
Mon 28/920:30 -
2 stops19h 25m
Wed 7/1006:10 -
2 stops21h 05m
Deal found 3/8£613
Mon 21/920:30 -
2 stops20h 30m
Mon 5/1020:15 -
3 stops47h 55m
Deal found 2/8£615
Mon 28/920:30 -
2 stops15h 20m
Wed 7/1007:00 -
2 stops20h 15m
Deal found 3/8£617
Sun 27/909:55 -
2 stops21h 00m
Mon 12/1014:30 -
2 stops33h 50m
Deal found 4/8£660
Sat 17/1020:30 -
2 stops19h 35m
Thu 22/1007:00 -
2 stops17h 20m
Deal found 4/8£703
Mon 21/918:10 -
1 stop10h 10m
Tue 6/1009:50 -
1 stop10h 45m
Deal found 2/8£708
Sun 27/917:40 -
1 stop10h 40m
Mon 12/1017:30 -
1 stop27h 05m
Deal found 4/8£710

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 4 August 2026.

Round-trip from

£564

One-way from

£212
British Airways
  • British Airways
  • 7/10-12/10
  • 2 total stops
  • 27h 25m total
  • Washington, D.C. to Belfast
Search Deals
5/10
  • 5/10
  • 3 total stops
  • 30h 35m 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 4 August 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

Tue 1/9

23:20-16:20

2 stops12h 00m

Belfast Intl

Mon 7/9

20:15-15:10

3 stops47h 55m

£572

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Mon 14/9

20:30-16:15

2 stops14h 45m

Belfast Intl

Mon 21/9

20:15-15:10

3 stops47h 55m

£582

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Sat 17/10

20:30-21:25

2 stops19h 55m

Belfast Intl

Thu 22/10

21:10-19:00

2 stops26h 50m

£590

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Mon 21/9

20:30-16:15

2 stops14h 45m

Belfast Intl

Mon 5/10

06:40-19:20

2 stops17h 40m

£663

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Thu 10/9

20:30-23:00

2 stops21h 30m

Belfast Intl

Sat 19/12

06:00-19:30

2 stops18h 30m

£704

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Wed 9/9

20:30-23:15

3 stops21h 45m

Belfast Intl

Sat 19/12

23:00-19:30

2 stops25h 30m

£709

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Thu 19/11

09:55-19:50

3 stops28h 55m

Belfast Intl

Wed 25/11

07:40-15:15

3 stops36h 35m

£712

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sun 8/11

21:45-13:55

1 stop11h 10m

Belfast City

Thu 12/11

20:00-15:40

1 stop24h 40m

£726

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sun 6/12

21:45-13:55

1 stop11h 10m

Belfast City

Thu 10/12

07:40-19:55

1 stop17h 15m

£726
Fastest return journey

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Thu 19/11

18:05-10:20

1 stop11h 15m

Belfast City

Wed 25/11

11:25-19:55

1 stop13h 30m

£739

Flights are sorted by cheapest return flights first.

Deals found on 3/8

Showing 1-10 of 29 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 £726, British Airways can have you in Belfast from Washington, D.C. Dulles Intl Airport in 11h 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

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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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