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Cheap flights from Washington, D.C. Dulles Intl Airport to Belfast from £464

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/10. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — BHD
15 Oct — 22 Oct1
1 adult
1 adult, Economy

Cheap 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 15 September 2025.

Round-trip from

£464

Popular in

June

Cheapest in

February

Average price

£477
American Airlines
  • American Airlines
  • 3/10-10/10
  • 2 total stops
  • 27h 50m total
  • Washington, D.C. to Belfast
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (£105 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£23 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2025
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Find flight deals from Dulles Intl to Belfast

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 15 September 2025.

Fri 3/1022:45IAD - BHD
1 stop14h 30mAmerican Airlines
Fri 10/1011:55BHD - IAD
1 stop13h 20mAmerican Airlines
Deal found 15/9£464
Mon 13/1017:25IAD - BHD
1 stop18h 30mMultiple Airlines
Mon 20/1017:25BHD - IAD
1 stop27h 10mMultiple Airlines
Deal found 15/9£522
Wed 12/1112:11IAD - BHD
2 stops27h 49mDelta
Sun 16/1117:20BHD - IAD
1 stop27h 45mDelta
Deal found 14/9£525
Wed 12/1118:20IAD - BHD
1 stop9h 50mBritish Airways
Sun 16/1110:40BHD - IAD
1 stop14h 15mBritish Airways
Deal found 14/9£551
Wed 29/1020:40IAD - BFS
2 stops20h 00mMultiple Airlines
Wed 5/1107:20BFS - IAD
2 stops16h 10mMultiple Airlines
Deal found 14/9£551
Tue 28/1018:30IAD - BFS
3 stops23h 00mMultiple Airlines
Tue 4/1107:05BFS - IAD
3 stops42h 55mMultiple Airlines
Deal found 13/9£553
Thu 30/1018:30IAD - BFS
3 stops19h 05mMultiple Airlines
Thu 6/1108:15BFS - IAD
3 stops41h 45mMultiple Airlines
Deal found 15/9£567
Sat 11/1022:50IAD - BHD
1 stop30h 15mBritish Airways
Sat 18/1016:15BHD - IAD
1 stop33h 05mBritish Airways
Deal found 13/9£599
Wed 17/917:25IAD - BHD
1 stop18h 30mKLM
Tue 23/917:25BHD - IAD
1 stop27h 10mKLM
Deal found 13/9£614
Sat 11/1014:25IAD - BFS
2 stops27h 05mMultiple Airlines
Sat 18/1010:35BFS - IAD
3 stops37h 30mMultiple Airlines
Deal found 13/9£628
Sat 11/1017:20IAD - BHD
2 stops13h 55mMultiple Airlines
Sat 18/1018:45BHD - IAD
2 stops26h 05mMultiple Airlines
Deal found 13/9£652
Fri 3/1017:20IAD - BHD
2 stops11h 30mBritish Airways
Fri 10/1006:50BHD - IAD
2 stops17h 05mBritish Airways
Deal found 15/9£654

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 15 September 2025.
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 - BHD

IADBHD

Washington, D.C. Dulles Intl

Fri 3/10

22:45-18:15

1 stop14h 30m

Belfast City

Fri 10/10

11:55-20:15

1 stop13h 20m

£464

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Mon 13/10

17:25-16:55

1 stop18h 30m

Belfast City

Mon 20/10

17:25-15:35

1 stop27h 10m

£522

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Wed 12/11

12:11-21:00

2 stops27h 49m

Belfast City

Sun 16/11

17:20-16:05

1 stop27h 45m

£525

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Wed 12/11

12:11-16:50

2 stops23h 39m

Belfast City

Sun 16/11

17:20-16:05

1 stop27h 45m

£525

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Mon 13/10

19:35-16:55

2 stops16h 20m

Belfast City

Mon 20/10

06:30-15:35

1 stop14h 05m

£525

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Wed 12/11

18:20-10:15

1 stop10h 55m

Belfast City

Sun 16/11

06:30-15:35

1 stop14h 05m

£551

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Wed 29/10

20:40-20:40

2 stops20h 00m

Belfast Intl

Wed 5/11

07:20-18:30

2 stops16h 10m

£551

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Tue 28/10

18:30-21:30

3 stops23h 00m

Belfast Intl

Tue 4/11

07:05-21:00

3 stops42h 55m

£553

Washington, D.C.Belfast

IAD - BFS

IADBFS

Washington, D.C. Dulles Intl

Thu 30/10

18:30-17:35

3 stops19h 05m

Belfast Intl

Thu 6/11

08:15-21:00

3 stops41h 45m

£567

Washington, D.C.Belfast

IAD - BHD

IADBHD

Washington, D.C. Dulles Intl

Sat 11/10

22:50-10:05

1 stop30h 15m

Belfast City

Sat 18/10

16:15-20:20

1 stop33h 05m

£599

Flights are sorted by cheapest return flights first.

Deals found on 12/9

Showing 1-10 of 21 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 £464, American Airlines can have you in Belfast from Washington, D.C. Dulles Intl Airport in 14h 30m. 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.

  • What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Belfast?

    Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Belfast (average of £67). Flying from Washington, D.C. Dulles Intl Airport to Belfast in July is currently the most expensive (average of £90). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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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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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