What is the cheapest month to book a flight from Northern Ireland to Washington, D.C. Dulles Intl Airport?

Currently, August is the cheapest month in which you can book a flight from Northern Ireland to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Northern Ireland to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $373). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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.

$835+ Flights from Northern Ireland to Washington, D.C. Dulles Intl Airport

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Cheap flight deals from Northern Ireland to Dulles Intl

Round-trip from	$835 (Expedia)

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

Search Deals

Find flight deals from Northern Ireland to Dulles Intl

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 April 28, 2025.

Wed 9/31:50 pmBHD - IAD

1 stop11h 20mBritish Airways

Wed 10/15:50 pmIAD - BHD

1 stop10h 00mBritish Airways

Deal found 4/28

$835

Fri 9/56:30 amBHD - IAD

1 stop14h 05mDelta

Mon 9/295:25 pmIAD - BHD

1 stop18h 30mDelta

Deal found 4/28

$888

Wed 9/35:25 pmBHD - IAD

2 stops23h 30mVirgin Atlantic

Wed 10/16:40 pmIAD - BHD

2 stops17h 15mVirgin Atlantic

Deal found 4/28

$1,036

Sun 9/78:05 pmBHD - IAD

2 stops27h 50mAer Lingus

Sun 9/285:20 pmIAD - BHD

2 stops13h 10mAer Lingus

Deal found 4/28

$1,049

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 April 28, 2025.

Wed 9/31:50 pmBHD - IAD

1 stop11h 20mBritish Airways

Wed 10/15:50 pmIAD - BHD

1 stop10h 00mBritish Airways

Deal found 4/28

$835

Fri 9/56:30 amBHD - IAD

1 stop14h 05mDelta

Mon 9/295:25 pmIAD - BHD

1 stop18h 30mDelta

Deal found 4/28

$888

Wed 9/35:25 pmBHD - IAD

2 stops23h 30mVirgin Atlantic

Wed 10/16:40 pmIAD - BHD

2 stops17h 15mVirgin Atlantic

Deal found 4/28

$1,036

Sun 9/78:05 pmBHD - IAD

2 stops27h 50mAer Lingus

Sun 9/285:20 pmIAD - BHD

2 stops13h 10mAer Lingus

Deal found 4/28

$1,049

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 April 28, 2025.

Mon 6/305:55 pmBHD - IAD

2 stops26h 55mAer Lingus

Deal found 4/28

$901

Mon 6/307:30 pmBHD - IAD

1 stop25h 25mFinnair

Deal found 4/28

$1,694

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.

BHD - IAD

BHDIAD

Belfast City

Wed 9/3

1:50 pm-8:10 pm

1 stop11h 20m

Washington, D.C. Dulles Intl

Wed 10/1

5:50 pm-8:50 am

1 stop10h 00m

$835

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Fri 9/5

6:30 am-3:35 pm

1 stop14h 05m

Washington, D.C. Dulles Intl

Mon 9/29

5:25 pm-4:55 pm

1 stop18h 30m

$888

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Wed 9/3

5:25 pm-11:55 am

2 stops23h 30m

Washington, D.C. Dulles Intl

Wed 10/1

6:40 pm-4:55 pm

2 stops17h 15m

$1,036

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Sun 9/7

8:05 pm-6:55 pm

2 stops27h 50m

Washington, D.C. Dulles Intl

Sun 9/28

5:20 pm-11:30 am

2 stops13h 10m

$1,049

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Mon 6/30

5:55 pm-3:50 pm

2 stops26h 55m

$901

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Mon 6/30

7:30 pm-3:55 pm

1 stop25h 25m

$1,694

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

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

Rainfall in Dulles Intl by month

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.

Temperature in Dulles Intl by month

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).

Reviews of airlines servicing Dulles Intl

Delta

8.0

Very good

7,929 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta

8.0

Very good

7,929 reviews

Delta

8.0

Very good

7,929 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Finnair

7.6

Good

1,273 reviews

Delta

8.0

Very good

7,929 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Virgin Atlantic

7.4

Good

642 reviews

Delta

8.0

Very good

7,929 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Aer Lingus

7.0

Good

1,076 reviews

Delta

8.0

Very good

7,929 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

British Airways

6.6

Okay

6,834 reviews

Delta

8.0

Very good

7,929 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

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.
What is the cheapest month to book a flight from Northern Ireland to Washington, D.C. Dulles Intl Airport?
Currently, August is the cheapest month in which you can book a flight from Northern Ireland to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Northern Ireland to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $373). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Arlington

Alexandria

Woodbridge

Fairfax

Tysons

Springfield

Rockville

Fredericksburg

Gaithersburg

Silver Spring

Linthicum Heights

Falls Church

Laurel

Easton

Herndon

Sterling

Bowie

Towson

National Harbor

Oxon Hill

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$835+ 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 9/3. 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

Keep the following information in mind while searching for Northern Ireland to Dulles Intl flight deals. Data was last updated April 28, 2025.

Round-trip from

Find 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 April 28, 2025.

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 April 28, 2025.

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

Rainfall in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average rainfall totals by month.

Temperature in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average temperature totals by month.

Reviews of airlines servicing Dulles Intl

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.

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?

What is the cheapest month to book a flight from Northern Ireland to Washington, D.C. Dulles Intl Airport?

Traveling to a place near Northern Ireland?

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

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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 April 28, 2025.