In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 2.6 in.

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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

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

When flying from Northern Ireland 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 Northern Ireland to Dulles Intl that include hotel bookings?

Yes. In addition to deals on Northern Ireland to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Northern Ireland to Dulles Intl?

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

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

Yes. Cheapflights offers flight deals from Northern Ireland 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.

$473+ Flights from Northern Ireland to Washington, D.C. Dulles Intl Airport

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Cheap flight deals from Northern Ireland to Dulles Intl

Best flights from Northern Ireland to Dulles Intl
Discover carefully curated flight deals from Northern Ireland to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 19, 2025.

Thu 1/2911:05 amBHD - IAD

1 stop13h 50mBritish Airways

Mon 2/25:46 pmIAD - BHD

2 stops15h 29mBritish Airways

Deal found 12/17

$755

Thu 2/59:05 amBHD - IAD

1 stop15h 50mBritish Airways

Mon 2/95:46 pmIAD - BHD

2 stops15h 29mBritish Airways

Deal found 12/17

$755

Last-minute flights from Northern Ireland to Dulles Intl
Discover last-minute flight deals from Northern Ireland to Dulles Intl. Data last updated December 19, 2025 and is based on user searches.

Thu 1/2911:05 amBHD - IAD

1 stop13h 50mBritish Airways

Mon 2/25:46 pmIAD - BHD

2 stops15h 29mBritish Airways

Deal found 12/17

$755

One-way flights from Northern Ireland to Dulles Intl
Search for one-way flight options from Northern Ireland to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated December 19, 2025.

Sat 3/2110:25 pmBFS - IAD

3 stops25h 20mMultiple Airlines

Deal found 12/18

$473

Sat 3/212:15 pmBHD - IAD

2 stops35h 45mMultiple Airlines

Deal found 12/18

$746

Sat 3/216:35 amBHD - IAD

1 stop18h 20mBritish Airways

Deal found 12/18

$806

Find flight deals from Northern Ireland to Dulles Intl

Round-trip from	$755 (British Airways)
One-way from	$473 (Kiwi.com)

From Northern Ireland to Washington, D.C. Dulles Intl

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One-way flight from Northern Ireland to Washington, D.C. Dulles Intl

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Use the filters below to find and compare flights from Northern Ireland to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Thu 1/29

11:05 am-7:55 pm

1 stop13h 50m

Washington, D.C. Dulles Intl

Mon 2/2

5:46 pm-2:15 pm

2 stops15h 29m

$755

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Thu 2/5

9:05 am-7:55 pm

1 stop15h 50m

Washington, D.C. Dulles Intl

Mon 2/9

5:46 pm-2:15 pm

2 stops15h 29m

$755

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Sat 3/21

10:25 pm-7:45 pm

3 stops25h 20m

$473

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Sat 3/21

2:15 pm-10:00 pm

2 stops35h 45m

$746

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Sat 3/21

6:35 am-8:55 pm

1 stop18h 20m

$806

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/18

Best time to book a flight from Northern Ireland to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Northern Ireland with our price prediction graph.

Estimated round-trip 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 Northern Ireland to Washington, D.C. Dulles Intl Airport

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Related info for your journey

How long is the flight from Northern Ireland to Washington, D.C. Dulles Intl Airport?
A quick flight from Northern Ireland to Washington, D.C. Dulles Intl Airport can take about 13h 50m. British Airways provides one of the quickest options available for as low as $755. Airlines will cover a distance of 3390 mi.
Can I find deals for flights from Northern Ireland to Dulles Intl that include hotel bookings?
Yes. In addition to deals on Northern Ireland to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Northern Ireland to Dulles Intl?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Northern Ireland to Dulles Intl.
Can I find deals for business class flights from Northern Ireland to Dulles Intl?
Yes. Cheapflights offers flight deals from Northern Ireland 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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$473+ Cheap flights from Northern Ireland to Dulles Intl (IAD)

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 3/21. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Northern Ireland to Dulles Intl with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Northern Ireland to Dulles Intl

Best flights from Northern Ireland to Dulles IntlDiscover carefully curated flight deals from Northern Ireland to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 19, 2025.

Discover carefully curated flight deals from Northern Ireland to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 19, 2025.

Find flight deals from Northern Ireland to Dulles Intl

Keep the following information in mind while searching for Northern Ireland to Dulles Intl flight deals. Data was last updated December 19, 2025.

Round-trip from

One-way from

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Use the filters below to find and compare flights from Northern Ireland to Washington, D.C. Dulles Intl Airport that are best for you.

Best time to book a flight from Northern Ireland to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Northern Ireland with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Northern Ireland to Washington, D.C. Dulles Intl Airport

Related info for your journey

Find useful and relevant information for your journey from Northern Ireland to Dulles Intl. 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 Northern Ireland to Washington, D.C. Dulles Intl Airport?

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

How can I find direct flights from Northern Ireland to Dulles Intl?

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

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

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Alternative routes for Northern Ireland to Dulles Intl

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Best flights from Northern Ireland to Dulles Intl
Discover carefully curated flight deals from Northern Ireland to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 19, 2025.