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.

$717+ Flights from Northern Ireland to Washington, D.C. Dulles Intl Airport

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

Find cheap flights from Northern Ireland to Dulles Intl with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Northern Ireland to Dulles Intl

Cheapest

Best

Last-minute

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 February 3, 2026.

Mon 2/237:50 am

BFS

IAD

3 stops35h 45m

Multiple Airlines

Mon 3/27:40 pm

IAD

BFS

2 stops11h 20m

Multiple Airlines

Deal found 2/3

$717

Thu 3/58:00 pm

BHD

IAD

1 stop28h 55m

British Airways

Mon 3/910:45 pm

IAD

BHD

1 stop11h 30m

British Airways

Deal found 2/2

$1,002

Thu 2/128:00 pm

BHD

IAD

1 stop28h 55m

British Airways

Mon 2/166:20 pm

IAD

BHD

1 stop11h 20m

British Airways

Deal found 2/2

$1,326

Wed 2/46:35 am

BHD

IAD

1 stop18h 20m

British Airways

Sun 2/81:08 pm

IAD

BHD

2 stops19h 47m

British Airways

Deal found 1/31

$1,451

Last-minute flights from Northern Ireland to Dulles Intl
Discover last-minute flight deals from Northern Ireland to Dulles Intl. Data last updated February 3, 2026 and is based on user searches.

Wed 2/46:35 am

BHD

IAD

1 stop18h 20m

British Airways

Sun 2/81:08 pm

IAD

BHD

2 stops19h 47m

British Airways

Deal found 1/31

$1,451

Thu 2/128:00 pm

BHD

IAD

1 stop28h 55m

British Airways

Mon 2/166:20 pm

IAD

BHD

1 stop11h 20m

British Airways

Deal found 2/2

$1,326

Mon 2/237:50 am

BFS

IAD

3 stops35h 45m

Multiple Airlines

Mon 3/27:40 pm

IAD

BFS

2 stops11h 20m

Multiple Airlines

Deal found 2/3

$717

Thu 3/58:00 pm

BHD

IAD

1 stop28h 55m

British Airways

Mon 3/910:45 pm

IAD

BHD

1 stop11h 30m

British Airways

Deal found 2/2

$1,002

Find flight deals from Northern Ireland to Dulles Intl

Round-trip from	$717 (Booking.com)

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

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

Mon 2/23

7:50 am-2:35 pm

3 stops35h 45m

Washington, D.C. Dulles Intl

Mon 3/2

7:40 pm-12:00 pm

2 stops11h 20m

$717

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Thu 3/5

8:00 pm-7:55 pm

1 stop28h 55m

Washington, D.C. Dulles Intl

Mon 3/9

10:45 pm-2:15 pm

1 stop11h 30m

$1,002

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/3

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 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

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?
A quick flight from Northern Ireland to Washington, D.C. Dulles Intl Airport can take about 28h 55m. British Airways provides one of the quickest options available for as low as $1,002. 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.

See more FAQs

Alexandria

Woodbridge

Tysons

Arlington

Owings Mills

Springfield

Silver Spring

Herndon

Fredericksburg

Hanover

Linthicum Heights

Rockville

Laurel

Towson

Upper Marlboro

Manassas

Largo

Bowie

McLean

Clinton

Browse thousands of different options on Cheapflights for your next trip

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

$717+ Cheap flights from Northern Ireland to Dulles Intl (IAD)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/23. 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

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 February 3, 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 February 3, 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 layovers in mind to ensure you get the best travel experience. Data last updated February 3, 2026.

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 February 3, 2026.

Last-minute flights from Northern Ireland to Dulles IntlDiscover last-minute flight deals from Northern Ireland to Dulles Intl. Data last updated February 3, 2026 and is based on user searches.

Discover last-minute flight deals from Northern Ireland to Dulles Intl. Data last updated February 3, 2026 and is based on user searches.

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 February 3, 2026.

Round-trip 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?

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Northern Ireland to Dulles Intl

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

100% Free

Book with Flexibility

Travel Smart

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 February 3, 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 layovers in mind to ensure you get the best travel experience. Data last updated February 3, 2026.

Last-minute flights from Northern Ireland to Dulles Intl
Discover last-minute flight deals from Northern Ireland to Dulles Intl. Data last updated February 3, 2026 and is based on user searches.