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.

£459+ 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 31 January 2026.

Sun 15/322:45

BFS

IAD

3 stops44h 50m

Multiple Airlines

Sun 22/323:30

IAD

BFS

2 stops15h 25m

Multiple Airlines

Deal found 29/1£648

Thu 5/306:35

BHD

IAD

1 stop18h 20m

British Airways

Mon 9/319:20

IAD

BHD

1 stop11h 20m

British Airways

Deal found 30/1£732

Wed 4/206:35

BHD

IAD

1 stop14h 00m

British Airways

Sun 8/218:20

IAD

BHD

1 stop14h 35m

British Airways

Deal found 30/1£1,060

Find flight deals from Northern Ireland to Dulles Intl

Round-trip from	£648
One-way from	£459

15/3-22/3
5 total stops
60h 15m total
Northern Ireland to Washington, D.C.

Search Deals

12/7
3 total stops
41h 00m 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.

Fly from

Fly to

Route

Depart

Return

Price

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Sun 15/3

22:45-15:35

3 stops44h 50m

Washington, D.C. Dulles Intl

Sun 22/3

23:30-18:55

2 stops15h 25m

£648

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Thu 5/3

06:35-19:55

1 stop18h 20m

Washington, D.C. Dulles Intl

Mon 9/3

19:20-10:40

1 stop11h 20m

£732

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Sun 1/3

17:20-16:35

2 stops52h 15m

Washington, D.C. Dulles Intl

Fri 6/3

18:50-16:50

2 stops17h 00m

£3,997

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Sun 1/3

06:30-16:05

1 stop14h 35m

Washington, D.C. Dulles Intl

Fri 6/3

18:50-16:50

2 stops17h 00m

£4,051

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Sun 1/3

06:30-16:05

1 stop14h 35m

Washington, D.C. Dulles Intl

Fri 6/3

18:05-16:50

1 stop17h 45m

£4,331

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Sun 12/7

07:10-19:10

3 stops41h 00m

£459

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Sun 12/7

07:00-14:12

3 stops36h 12m

£475

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Sun 12/7

15:50-17:25

1 stop30h 35m

£585

Flights are sorted by cheapest return flights first.

Deals found on 28/1

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 18h 20m. 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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Cheap flights from Northern Ireland to Washington, D.C. Dulles Intl Airport from £459

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 12/7. 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 31 January 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 31 January 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 31 January 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 31 January 2026.

Last-minute flights from Northern Ireland to Dulles IntlDiscover last-minute flight deals from Northern Ireland to Dulles Intl. Data last updated 31 January 2026 and is based on user searches.

Discover last-minute flight deals from Northern Ireland to Dulles Intl. Data last updated 31 January 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 31 January 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 31 January 2026.

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 31 January 2026.

Round-trip from

One-way from

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.

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?

Travelling 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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How does Cheapflights help users find flights from Northern Ireland to Dulles Intl?

Why should you use Cheapflights to find cheap flight tickets from Northern Ireland to Dulles Intl?

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

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 31 January 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 31 January 2026.

Last-minute flights from Northern Ireland to Dulles Intl
Discover last-minute flight deals from Northern Ireland to Dulles Intl. Data last updated 31 January 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 31 January 2026.