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 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 holiday 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.

£325+ Cheap Flights from Northern Ireland to Washington, D.C. Dulles Intl Airport

Cheap flight deals from Northern Ireland to Dulles Intl

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Cheapest flights from Northern Ireland to Dulles Intl
Explore the most affordable flight options available from Northern Ireland to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 September 2026.

Thu 29/1006:30 -

2 stops17h 00m

Thu 5/1119:40 -

2 stops16h 25m

Deal found 14/9£479

Wed 30/919:40 -

1 stop26h 45m

Sun 4/1017:45 -

1 stop11h 45m

Deal found 13/9£600

Wed 30/917:30 -

1 stop27h 05m

Sun 4/1012:25 -

2 stops15h 55m

Deal found 13/9£706

Find flight deals from Northern Ireland to Dulles Intl

Round-trip from	£479
One-way from	£325

29/10-5/11
4 total stops
33h 25m total
Northern Ireland to Washington, D.C.

Search Deals

22/11-31/12
2 total stops
28h 40m total
Northern Ireland to Washington, D.C.

Search Deals

Cheapflights Fare Finder

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

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Fly to

Route

Depart

Return

Price

Cheapest return flight

BelfastWashington, D.C.

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

BFSIAD

Belfast Intl

Sun 22/11

16:40-16:20

2 stops28h 40m

Washington, D.C. Dulles Intl

Wed 31/12

00:00-06:00

Nonstop0h 00m

£325

BelfastWashington, D.C.

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

BFSIAD

Belfast Intl

Fri 2/10

22:15-19:00

3 stops49h 45m

Washington, D.C. Dulles Intl

Wed 31/12

00:00-06:00

Nonstop0h 00m

£420

BelfastWashington, D.C.

BHD Belfast City - IAD Washington, D.C. Dulles Intl

BHDIAD

Belfast City

Fri 16/10

14:55-19:00

3 stops57h 05m

Washington, D.C. Dulles Intl

Wed 31/12

00:00-06:00

Nonstop0h 00m

£459

BelfastWashington, D.C.

BHD Belfast City - IAD Washington, D.C. Dulles Intl

BHDIAD

Belfast City

Fri 2/10

07:00-10:45

2 stops32h 45m

Washington, D.C. Dulles Intl

Wed 31/12

00:00-06:00

Nonstop0h 00m

£460

BelfastWashington, D.C.

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

BFSIAD

Belfast Intl

Thu 29/10

06:30-19:30

2 stops17h 00m

Washington, D.C. Dulles Intl

Thu 5/11

19:40-17:05

2 stops16h 25m

£479

BelfastWashington, D.C.

BHD Belfast City - IAD Washington, D.C. Dulles Intl

BHDIAD

Belfast City

Fri 16/10

09:50-19:25

2 stops14h 35m

Washington, D.C. Dulles Intl

Wed 31/12

00:00-06:00

Nonstop0h 00m

£524

BelfastWashington, D.C.

BHD Belfast City - IAD Washington, D.C. Dulles Intl

BHDIAD

Belfast City

Mon 5/10

17:55-19:35

2 stops30h 40m

Washington, D.C. Dulles Intl

Wed 31/12

00:00-06:00

Nonstop0h 00m

£527

BelfastWashington, D.C.

BHD Belfast City - IAD Washington, D.C. Dulles Intl

BHDIAD

Belfast City

Thu 21/1

17:50-16:20

2 stops27h 30m

Washington, D.C. Dulles Intl

Mon 25/1

16:13-16:05

2 stops18h 52m

£594

BelfastWashington, D.C.

BHD Belfast City - IAD Washington, D.C. Dulles Intl

BHDIAD

Belfast City

Wed 30/9

19:40-17:25

1 stop26h 45m

Washington, D.C. Dulles Intl

Sun 4/10

17:45-10:30

1 stop11h 45m

£600

BelfastWashington, D.C.

BHD Belfast City - IAD Washington, D.C. Dulles Intl

BHDIAD

Belfast City

Fri 2/10

06:30-17:25

1 stop15h 55m

Washington, D.C. Dulles Intl

Wed 31/12

00:00-06:00

Nonstop0h 00m

£659

Flights are sorted by cheapest return flights first.

Deals found on 14/9

Showing 1-10 of 13 resultsSorted by cheapest first

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.

BFS-IAD

BHD-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.

Cheapflights Insights

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

GBNIR-IAD

BFS-IAD

BHD-IAD

No data available for this route at this time. Please check back soon.

Related info for your journey

How long is the flight from Northern Ireland to Washington, D.C. Dulles Intl Airport?
Airlines like British Airways fly from Northern Ireland to Washington, D.C. Dulles Intl Airport in about 27h 30m. The time it takes to get you to your destination can typically vary by up to . The distance from Northern Ireland to Washington, D.C. Dulles Intl Airport is about 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 holiday 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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Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Northern Ireland to Dulles Intl. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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Millions of users choose and trust Cheapflights to book the best flight deals from Northern Ireland to Dulles Intl for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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

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Cheap flights from Northern Ireland to Washington, D.C. Dulles Intl Airport from £325

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 22/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Northern Ireland to Dulles Intl

Cheapest flights from Northern Ireland to Dulles IntlExplore the most affordable flight options available from Northern Ireland to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 September 2026.

Explore the most affordable flight options available from Northern Ireland to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 September 2026.

Best flights from Northern Ireland to Dulles IntlDiscover carefully curated flight deals from Northern Ireland to Dulles Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 16 September 2026.

Discover carefully curated flight deals from Northern Ireland to Dulles Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 16 September 2026.

Last-minute flights from Northern Ireland to Dulles IntlDiscover last-minute flight deals from Northern Ireland to Dulles Intl. Data last updated 16 September 2026 and is based on user searches.

Discover last-minute flight deals from Northern Ireland to Dulles Intl. Data last updated 16 September 2026 and is based on user searches.

One-way flights from Northern Ireland to Dulles IntlSearch for one-way flight options from Northern Ireland to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated 16 September 2026.

Search for one-way flight options from Northern Ireland to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated 16 September 2026.

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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

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Related info for your journey

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?

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

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Alternative routes for Northern Ireland to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.

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 16 September 2026.

Search flights from Northern Ireland to Dulles Intl by cabin class

Find flights from Northern Ireland to Dulles Intl, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Northern Ireland and Dulles Intl flights

Browse other Northern Ireland and Dulles Intl flight options. Last updated on 16 September 2026.

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Cheapest flights from Northern Ireland to Dulles Intl
Explore the most affordable flight options available from Northern Ireland to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 September 2026.

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 stopovers in mind to ensure you get the best travel experience. Data last updated 16 September 2026.

Last-minute flights from Northern Ireland to Dulles Intl
Discover last-minute flight deals from Northern Ireland to Dulles Intl. Data last updated 16 September 2026 and is based on user searches.

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 16 September 2026.