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Cheap flights from Belfast Intl Airport to Washington, D.C. Dulles Intl Airport from £343

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 24/8. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — IAD
12 Jun — 19 Jun1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Belfast Intl to Dulles Intl

Enter your travel dates to find the best prices.

Cheapest flights from Belfast Intl to Dulles Intl
Explore the most affordable flight options available from Belfast Intl to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 May 2026.

Thu 11/615:35
BFS
-
IAD
2 stops30h 25m
Multiple Airlines
Wed 17/620:20
IAD
-
BFS
2 stops21h 55m
Multiple Airlines
Deal found 12/5£767
Fri 22/508:20
BFS
-
IAD
2 stops16h 05m
Multiple Airlines
Mon 25/517:15
IAD
-
BFS
2 stops13h 00m
Multiple Airlines
Deal found 9/5£776
Thu 25/606:40
BFS
-
IAD
2 stops17h 20m
Multiple Airlines
Thu 2/717:15
IAD
-
BFS
2 stops20h 40m
Multiple Airlines
Deal found 11/5£780
Sun 24/508:25
BFS
-
IAD
2 stops17h 04m
Multiple Airlines
Mon 7/920:30
IAD
-
BFS
2 stops19h 10m
Multiple Airlines
Deal found 11/5£828

Find flight deals from Belfast Intl to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Belfast Intl (BFS) to Dulles Intl (IAD). 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 13 May 2026.

Round-trip from

£767

One-way from

£343
11/6-17/6
  • 11/6-17/6
  • 4 total stops
  • 52h 20m total
  • Belfast to Washington, D.C.
Search Deals
24/8
  • 24/8
  • 3 total stops
  • 50h 55m total
  • Belfast to Washington, D.C.
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Belfast Intl to Dulles Intl 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 13 May 2026.
Use the filters below to find and compare flights from Belfast Intl Airport to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Thu 11/6

15:35-17:00

2 stops30h 25m

Washington, D.C. Dulles Intl

Wed 17/6

20:20-23:15

2 stops21h 55m

£767
Fastest return journey

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Sun 24/5

08:25-20:29

2 stops17h 04m

Washington, D.C. Dulles Intl

Mon 7/9

20:30-20:40

2 stops19h 10m

£828

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Thu 25/6

06:40-20:24

2 stops18h 44m

Washington, D.C. Dulles Intl

Thu 2/7

09:55-11:50

3 stops20h 55m

£906
Cheapest one-way

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Sun 18/10

07:10-19:00

3 stops40h 50m

£355
Fastest single journey

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Mon 24/8

17:35-19:35

2 stops31h 00m

£361

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Wed 30/9

09:55-19:10

3 stops38h 15m

£379

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Wed 15/7

05:55-19:58

3 stops43h 03m

£405

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Tue 14/7

07:35-15:30

3 stops36h 55m

£478

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Thu 16/7

12:45-15:45

2 stops32h 00m

£506

Flights are sorted by cheapest return flights first.

Deals found on 9/5

Sorted by cheapest first

Best time to book a flight from Belfast Intl to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Belfast 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.

Related info for your journey

Find useful and relevant information for your journey from Belfast Intl to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • Can I find deals for flights from Belfast Intl to Dulles Intl that include hotel bookings?

    Yes. In addition to deals on Belfast Intl to Dulles Intl flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Belfast Intl to Dulles Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Belfast Intl to Dulles Intl.

  • Can I find deals for business class flights from Belfast Intl to Dulles Intl?

    Yes. Cheapflights offers flight deals from Belfast Intl to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

Travelling to a place near Washington, D.C. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Silver Spring
Hanover
Oxon Hill
Gaithersburg
Woodbridge
Arlington
Alexandria
Sterling

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Alternative routes for Belfast Intl to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.
Belfast Intl to Baltimore flights
Belfast City to Baltimore flights
Belfast City to Reagan-National flights
Belfast City to Dulles Intl flights

Fly with Cheapflights

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

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

Cheapflights helps you find that perfect flight to Dulles Intl from Belfast Intl by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Belfast Intl to Dulles Intl with no change fees?

Need flexible booking options for your flight to Dulles Intl from Belfast 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 Belfast Intl to Dulles Intl become cheaper?

Of course! You can now track prices for flights from Belfast Intl to Dulles Intl and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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