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.

£670+ Cheap Flights from Northern Ireland to Washington, D.C. Dulles Intl Airport

Cheap flight deals from Northern Ireland to Dulles Intl

Enter your travel dates to find the best prices.

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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 8 November 2026.

Fri 4/1211:50 -

1 stop13h 05m

Tue 8/1218:05 -

1 stop11h 45m

Deal found 6/11£670

Sat 5/1206:35 -

1 stop14h 05m

Wed 9/1221:55 -

1 stop10h 20m

Deal found 7/11£696

Fri 4/1211:50 -

1 stop13h 05m

Tue 8/1221:45 -

1 stop14h 00m

Deal found 5/11£700

Thu 3/1206:45 -

1 stop18h 10m

Mon 7/1221:45 -

1 stop13h 10m

Deal found 7/11£720

Thu 3/1206:30 -

1 stop14h 10m

Mon 7/1219:14 -

2 stops15h 41m

Deal found 7/11£724

Find flight deals from Northern Ireland to Dulles Intl

Round-trip from	£670

British Airways
4/12-8/12
2 total stops
24h 50m total
Northern Ireland to Washington, D.C.

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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.

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Route

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Cheapest return flight

BelfastWashington, D.C.

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

BHDIAD

Belfast City

Wed 20/1

17:35-16:20

2 stops27h 45m

Washington, D.C. Dulles Intl

Sun 24/1

21:45-13:50

1 stop11h 05m

£722

BelfastWashington, D.C.

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

BHDIAD

Belfast City

Fri 4/12

17:05-15:55

1 stop27h 50m

Washington, D.C. Dulles Intl

Tue 8/12

12:35-09:10

2 stops15h 35m

£722

Fastest return journey

BelfastWashington, D.C.

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

BHDIAD

Belfast City

Thu 3/12

06:30-15:40

1 stop14h 10m

Washington, D.C. Dulles Intl

Mon 7/12

19:14-15:55

2 stops15h 41m

£724

Flights are sorted by cheapest return flights first.

Deals found on 7/11

Sorted 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.

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.

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

GBNIR-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 and KLM fly from Northern Ireland to Washington, D.C. Dulles Intl Airport in about 27h 45m. The time it takes to get you to your destination can typically vary by up to 05m. The distance from Northern Ireland to Washington, D.C. Dulles Intl Airport is about 3390 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
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.

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

Users can book flights with no change fees policies with our dedicated filters. Book flights from Northern Ireland to Dulles Intl flexibly with Cheapflights today.

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 £670

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/12. 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 8 November 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 8 November 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 8 November 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 8 November 2026.

Last-minute flights from Northern Ireland to Dulles IntlDiscover last-minute flight deals from Northern Ireland to Dulles Intl. Data last updated 8 November 2026 and is based on user searches.

Discover last-minute flight deals from Northern Ireland to Dulles Intl. Data last updated 8 November 2026 and is based on user searches.

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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 8 November 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 8 November 2026.

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

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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 8 November 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 8 November 2026.

Last-minute flights from Northern Ireland to Dulles Intl
Discover last-minute flight deals from Northern Ireland to Dulles Intl. Data last updated 8 November 2026 and is based on user searches.