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

Currently, August is the cheapest month in which you can book a flight from Northern Ireland to Washington, D.C. (average of $309). Flying from Northern Ireland to Washington, D.C. in July is currently the most expensive (average of $345). 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.

In terms of precipitation, rainfall in Washington, D.C. 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. when rainfall is around 2.6 in.

If weather is an important factor for your trip to Washington, D.C., 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 are the most popular routes from Northern Ireland to Washington, D.C.?

The most popular route from Northern Ireland to Washington, D.C. is Belfast Intl - Baltimore/Washington. You may also consider Belfast Intl - Washington, D.C. Dulles Intl or Belfast Intl - Washington, D.C. Reagan-National.

What is the cheapest time of day to fly from NIR to WAS?

When flying from Northern Ireland to Washington, D.C., the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How can I find direct flights from Northern Ireland to Washington, D.C.?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Northern Ireland to Washington, D.C..

Can I find deals for business class flights from Northern Ireland to Washington, D.C.?

Yes. Cheapflights offers flight deals from Northern Ireland to Washington, D.C. by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$377+ Flights from Northern Ireland to Washington, D.C.

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Cheap flight deals from Northern Ireland to Washington, D.C.

Round-trip from	$761 (American Airlines)
One-way from	$377 (Kiwi.com)

From Northern Ireland to Washington, D.C. (WAS)

Search Deals

One-way flight from Northern Ireland to Washington, D.C. (WAS)

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Find flight deals from Northern Ireland to Washington, D.C.

Cheapest flights from Northern Ireland to Washington, D.C.
Explore the most affordable flight options available from Northern Ireland to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.

Thu 11/209:00 amBHD - IAD

1 stop15h 45mAmerican Airlines

Mon 11/245:49 pmIAD - BHD

2 stops19h 46mAmerican Airlines

Deal found 6/30

$761

Thu 11/1311:05 amBHD - DCA

2 stops17h 19mAmerican Airlines

Mon 11/173:59 pmDCA - BHD

2 stops13h 31mAmerican Airlines

Deal found 7/2

$765

Thu 11/206:30 amBHD - IAD

1 stop14h 15mDelta

Mon 11/245:35 pmIAD - BHD

1 stop18h 15mDelta

Deal found 7/2

$819

Thu 11/205:20 pmBHD - IAD

2 stops34h 40mVirgin Atlantic

Mon 11/2412:30 pmIAD - BHD

2 stops23h 20mVirgin Atlantic

Deal found 7/1

$828

Fri 8/159:20 pmBFS - BWI

2 stops25h 20mMultiple Airlines

Fri 8/226:50 pmBWI - BFS

3 stops21h 10mMultiple Airlines

Deal found 7/1

$919

Fri 8/156:05 amBFS - IAD

2 stops21h 05mMultiple Airlines

Fri 8/2211:15 pmIAD - BFS

2 stops15h 50mMultiple Airlines

Deal found 7/1

$1,098

Best flights from Northern Ireland to Washington, D.C.
Discover carefully curated flight deals from Northern Ireland to Washington, D.C. that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 3, 2025.

Thu 11/209:00 amBHD - IAD

1 stop15h 45mAmerican Airlines

Mon 11/245:49 pmIAD - BHD

2 stops19h 46mAmerican Airlines

Deal found 6/30

$761

Thu 11/206:30 amBHD - IAD

1 stop14h 15mDelta

Mon 11/245:35 pmIAD - BHD

1 stop18h 15mDelta

Deal found 7/2

$819

Thu 11/205:20 pmBHD - IAD

2 stops34h 40mVirgin Atlantic

Mon 11/2412:30 pmIAD - BHD

2 stops23h 20mVirgin Atlantic

Deal found 7/1

$828

Fri 8/159:20 pmBFS - BWI

2 stops25h 20mMultiple Airlines

Fri 8/226:50 pmBWI - BFS

3 stops21h 10mMultiple Airlines

Deal found 7/1

$919

Thu 11/1311:05 amBHD - DCA

2 stops17h 19mAmerican Airlines

Mon 11/173:59 pmDCA - BHD

2 stops13h 31mAmerican Airlines

Deal found 7/2

$765

Fri 8/156:05 amBFS - IAD

2 stops21h 05mMultiple Airlines

Fri 8/2211:15 pmIAD - BFS

2 stops15h 50mMultiple Airlines

Deal found 7/1

$1,098

Last-minute flights from Northern Ireland to Washington, D.C.
Discover last-minute flight deals from Northern Ireland to Washington, D.C.. Data last updated July 3, 2025 and is based on user searches.

Fri 8/159:20 pmBFS - BWI

2 stops25h 20mMultiple Airlines

Fri 8/226:50 pmBWI - BFS

3 stops21h 10mMultiple Airlines

Deal found 7/1

$919

Fri 8/156:05 amBFS - IAD

2 stops21h 05mMultiple Airlines

Fri 8/2211:15 pmIAD - BFS

2 stops15h 50mMultiple Airlines

Deal found 7/1

$1,098

One-way flights from Northern Ireland to Washington, D.C.
Search for one-way flight options from Northern Ireland to Washington, D.C.. Find affordable one-way fares based on user searches. Data last updated July 3, 2025.

Fri 9/266:05 amBFS - BWI

2 stops17h 44mMultiple Airlines

Deal found 7/1

$377

Fri 9/269:05 pmBFS - IAD

2 stops46h 08mMultiple Airlines

Deal found 7/1

$404

Fri 9/264:35 pmBHD - IAD

3 stops27h 45mMultiple Airlines

Deal found 7/1

$587

Fri 9/266:05 amBFS - DCA

3 stops21h 45mMultiple Airlines

Deal found 7/1

$597

Fri 9/267:00 amBHD - DCA

3 stops20h 50mMultiple Airlines

Deal found 7/1

$646

Fri 9/266:50 amBHD - IAD

2 stops17h 05mAer Lingus

Deal found 7/1

$736

Fri 9/2611:00 amBHD - BWI

2 stops13h 25mMultiple Airlines

Deal found 7/1

$818

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Thu 11/20

9:00 am-7:45 pm

1 stop15h 45m

Washington, D.C. Dulles Intl

Mon 11/24

5:49 pm-6:35 pm

2 stops19h 46m

$761

BelfastWashington, D.C.

BHD - DCA

BHDDCA

Belfast City

Thu 11/13

11:05 am-11:24 pm

2 stops17h 19m

Washington, D.C. Reagan-National

Mon 11/17

3:59 pm-10:30 am

2 stops13h 31m

$765

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Thu 11/20

6:30 am-3:45 pm

1 stop14h 15m

Washington, D.C. Dulles Intl

Mon 11/24

5:35 pm-4:50 pm

1 stop18h 15m

$819

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Thu 11/20

5:20 pm-11:00 pm

2 stops34h 40m

Washington, D.C. Dulles Intl

Mon 11/24

12:30 pm-4:50 pm

2 stops23h 20m

$828

BelfastBaltimore

BFS - BWI

BFSBWI

Belfast Intl

Fri 8/15

9:20 pm-5:40 pm

2 stops25h 20m

Baltimore/Washington

Fri 8/22

6:50 pm-9:00 pm

3 stops21h 10m

$919

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Fri 8/15

6:05 am-10:10 pm

2 stops21h 05m

Washington, D.C. Dulles Intl

Fri 8/22

11:15 pm-8:05 pm

2 stops15h 50m

$1,098

BelfastBaltimore

BFS - BWI

BFSBWI

Belfast Intl

Fri 9/26

6:05 am-6:49 pm

2 stops17h 44m

$377

BelfastWashington, D.C.

BFS - IAD

BFSIAD

Belfast Intl

Fri 9/26

9:05 pm-2:13 pm

2 stops46h 08m

$404

BelfastWashington, D.C.

BHD - IAD

BHDIAD

Belfast City

Fri 9/26

4:35 pm-3:20 pm

3 stops27h 45m

$587

BelfastWashington, D.C.

BFS - DCA

BFSDCA

Belfast Intl

Fri 9/26

6:05 am-10:50 pm

3 stops21h 45m

$597

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/1

Showing 1-10 of 13 results

Best time to book a flight from Northern Ireland to Washington, D.C.

Have a flexible travel schedule? Discover the best time to fly to Washington, D.C. 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.

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

Reviews of airlines servicing Washington, D.C.

Get a feel of what it's like to fly with Delta, Virgin Atlantic, and American Airlines from Northern Ireland to Washington, D.C. by reading reviews from past customers. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,982 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Delta

8.0

Very good

7,982 reviews

Delta

8.0

Very good

7,982 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Virgin Atlantic

7.4

Good

654 reviews

Delta

8.0

Very good

7,982 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

American Airlines

7.2

Good

10,000 reviews

Delta

8.0

Very good

7,982 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Aer Lingus

7.1

Good

1,144 reviews

Delta

8.0

Very good

7,982 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

What are the most popular routes from Northern Ireland to Washington, D.C.?
The most popular route from Northern Ireland to Washington, D.C. is Belfast Intl - Baltimore/Washington. You may also consider Belfast Intl - Washington, D.C. Dulles Intl or Belfast Intl - Washington, D.C. Reagan-National.
Can I find deals for flights from Northern Ireland to Washington, D.C. that include hotel bookings?
Yes. In addition to deals on Northern Ireland to Washington, D.C. flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Northern Ireland to Washington, D.C.?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Northern Ireland to Washington, D.C..
Can I find deals for business class flights from Northern Ireland to Washington, D.C.?
Yes. Cheapflights offers flight deals from Northern Ireland to Washington, D.C. 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.?
Currently, August is the cheapest month in which you can book a flight from Northern Ireland to Washington, D.C. (average of $309). Flying from Northern Ireland to Washington, D.C. in July is currently the most expensive (average of $345). 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

Woodbridge

Alexandria

Tysons

Silver Spring

Fredericksburg

Linthicum Heights

Gaithersburg

Fairfax

Easton

Towson

Waldorf

Laurel

Falls Church

Rockville

Springfield

National Harbor

Manassas

Dundalk

Bowie

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$377+ Cheap flights from Northern Ireland to Washington, D.C. (WAS)

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 9/26. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Northern Ireland to Washington, D.C. 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 Washington, D.C.

Keep the following information in mind while searching for Northern Ireland to Washington, D.C. flight deals. Data was last updated July 3, 2025.

Round-trip from

One-way from

Find flight deals from Northern Ireland to Washington, D.C.

Cheapest flights from Northern Ireland to Washington, D.C.Explore the most affordable flight options available from Northern Ireland to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.

Explore the most affordable flight options available from Northern Ireland to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.

Cheapflights Fare Finder

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

Best time to book a flight from Northern Ireland to Washington, D.C.

Have a flexible travel schedule? Discover the best time to fly to Washington, D.C. 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.

Reviews of airlines servicing Washington, D.C.

Get a feel of what it's like to fly with Delta, Virgin Atlantic, and American Airlines from Northern Ireland to Washington, D.C. by reading reviews from past customers. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Northern Ireland to Washington, D.C.. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What are the most popular routes from Northern Ireland to Washington, D.C.?

Can I find deals for flights from Northern Ireland to Washington, D.C. that include hotel bookings?

How can I find direct flights from Northern Ireland to Washington, D.C.?

Can I find deals for business class flights from Northern Ireland to Washington, D.C.?

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

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 Washington, D.C.

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

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Travel Smart

Cheapest flights from Northern Ireland to Washington, D.C.
Explore the most affordable flight options available from Northern Ireland to Washington, D.C.. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.