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.

£547+ Flights from Belfast Intl Airport to Washington, D.C. Dulles Intl Airport

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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 26 October 2025.

Wed 14/114:15BFS - IAD

3 stops30h 00mMultiple Airlines

Sat 17/117:30IAD - BFS

2 stops24h 10mMultiple Airlines

Deal found 25/10£547

Cheap flight deals from Belfast Intl to Dulles Intl

Round-trip from	£547

14/1-17/1
5 total stops
54h 10m 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.

Fly from

Fly to

Route

Depart

Return

Price

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Wed 14/1

14:15-15:15

3 stops30h 00m

Washington, D.C. Dulles Intl

Sat 17/1

17:30-22:40

2 stops24h 10m

£547

Flights are sorted by cheapest return flights first.

Deals found on 25/10

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

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.

Silver Spring

Hanover

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Woodbridge

Arlington

Alexandria

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Tysons

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Cheap flights from Belfast Intl Airport to Washington, D.C. Dulles Intl Airport from £547

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 14/1. Fares are subject to change and may not be available on all flights or dates of travel.

Find flight deals from Belfast Intl to Dulles Intl

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 26 October 2025.

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 26 October 2025.