In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 66.0 - 102.0 inches per month. May is typically the wettest month, when rainfall can reach 102.0 mm. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 66.0 mm.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 27.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 2.0 C).

What is the cheapest time of day to fly from BFS to IAD?

When flying from Belfast Intl Airport to Washington, D.C. Dulles Intl Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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.

£314+ Cheap Flights from Belfast Intl Airport to Washington, D.C. Dulles Intl Airport

Cheap flight deals from Belfast Intl to Dulles Intl

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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 25 September 2026.

Fri 6/1116:10 -

2 stops28h 45m

Fri 13/1118:40 -

2 stops22h 55m

Deal found 22/9£615

Find flight deals from Belfast Intl to Dulles Intl

Round-trip from	£615
One-way from	£314

6/11-13/11
4 total stops
51h 40m total
Belfast to Washington, D.C.

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18/11-31/12
2 total stops
30h 20m total
Belfast to Washington, D.C.

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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.

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Cheapest return flight

BelfastWashington, D.C.

BFS Belfast Intl - IAD Washington, D.C. Dulles Intl

BFSIAD

Belfast Intl

Wed 18/11

18:00-19:20

2 stops30h 20m

Washington, D.C. Dulles Intl

Wed 31/12

00:00-06:00

Nonstop0h 00m

£314

BelfastWashington, D.C.

BFS Belfast Intl - IAD Washington, D.C. Dulles Intl

BFSIAD

Belfast Intl

Thu 19/11

21:00-15:15

3 stops47h 15m

Washington, D.C. Dulles Intl

Wed 31/12

00:00-06:00

Nonstop0h 00m

£322

BelfastWashington, D.C.

BFS Belfast Intl - IAD Washington, D.C. Dulles Intl

BFSIAD

Belfast Intl

Tue 17/11

18:25-18:30

2 stops29h 05m

Washington, D.C. Dulles Intl

Wed 31/12

00:00-06:00

Nonstop0h 00m

£361

Fastest return journey

BelfastWashington, D.C.

BFS Belfast Intl - IAD Washington, D.C. Dulles Intl

BFSIAD

Belfast Intl

Fri 20/11

06:00-19:05

2 stops18h 05m

Washington, D.C. Dulles Intl

Wed 31/12

00:00-06:00

Nonstop0h 00m

£383

BelfastWashington, D.C.

BFS Belfast Intl - IAD Washington, D.C. Dulles Intl

BFSIAD

Belfast Intl

Sun 15/11

18:05-15:55

1 stop26h 50m

Washington, D.C. Dulles Intl

Wed 31/12

00:00-06:00

Nonstop0h 00m

£547

BelfastWashington, D.C.

BFS Belfast Intl - IAD Washington, D.C. Dulles Intl

BFSIAD

Belfast Intl

Fri 6/11

16:10-15:55

2 stops28h 45m

Washington, D.C. Dulles Intl

Fri 13/11

18:40-22:35

2 stops22h 55m

£615

Flights are sorted by cheapest return flights first.

Deals found on 24/9

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.

BFS-IAD

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

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.

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Cheap flights from Belfast Intl Airport to Washington, D.C. Dulles Intl Airport from £314

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 18/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Belfast Intl to Dulles Intl

Cheapest flights from Belfast Intl to Dulles IntlExplore 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 25 September 2026.

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 25 September 2026.

Best flights from Belfast Intl to Dulles IntlDiscover carefully curated flight deals from Belfast Intl to Dulles Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 25 September 2026.

Discover carefully curated flight deals from Belfast Intl to Dulles Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 25 September 2026.

One-way flights from Belfast Intl to Dulles IntlSearch for one-way flight options from Belfast Intl to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated 25 September 2026.

Search for one-way flight options from Belfast Intl to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated 25 September 2026.

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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.

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

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Related info for your journey

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

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

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

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

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Alternative routes for Belfast Intl to Dulles Intl

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Complete your trip

Complete your trip to Dulles Intl by adding a car hire and/or hotel booking to your travel itinerary.

Direct flights to District of Columbia

Book a non-stop flight to one of these other cities located in District of Columbia.

Other flights to Dulles Intl

Explore flights to Dulles Intl departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 25 September 2026.

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Belfast Intl and Dulles Intl flights

Browse other Belfast Intl and Dulles Intl flight options. Last updated on 25 September 2026.

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

Can Cheapflights notify me if prices for flights from Belfast Intl to Dulles Intl become cheaper?

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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 25 September 2026.

Best flights from Belfast Intl to Dulles Intl
Discover carefully curated flight deals from Belfast Intl to Dulles Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 25 September 2026.

One-way flights from Belfast Intl to Dulles Intl
Search for one-way flight options from Belfast Intl to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated 25 September 2026.