$873 Cheap Flights from Londonderry (LDY) to Washington (IAD)

View $873 flight on Mon, Aug 25, 2025Opens in a new window

Popular airlines from Londonderry (LDY-City of Derry) to Washington Dulles Intl. Airport (IAD)

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Cheap Flights from Londonderry to Washington (LDY-IAD)

Prices were available within the past 7 days and start at $873 for one-way flights and $1,000 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

British Airways
Thu, Sep 25 - Sun, Sep 28
LDY
Londonderry
IAD
Washington
$1,000 Roundtrip, found 1 day ago
$1,000
Roundtrip
found 1 day ago
Select British Airways flight, departing Thu, Sep 25 from Londonderry to Washington, returning Sun, Sep 28, priced at $1,000 found 1 day ago
British Airways
Thu, Sep 25 - Sun, Sep 28
LDY
Londonderry
IAD
Washington
$1,023 Roundtrip, found 1 day ago
$1,023
Roundtrip
found 1 day ago
Select British Airways flight, departing Thu, Sep 25 from Londonderry to Washington, returning Sun, Sep 28, priced at $1,023 found 1 day ago
Loganair
Thu, Sep 25 - Sun, Sep 28
LDY
Londonderry
IAD
Washington
$1,048 Roundtrip, found 1 day ago
$1,048
Roundtrip
found 1 day ago
Select Loganair flight, departing Thu, Sep 25 from Londonderry to Washington, returning Sun, Sep 28, priced at $1,048 found 1 day ago
Loganair
Thu, Sep 25 - Sun, Sep 28
LDY
Londonderry
IAD
Washington
$1,084 Roundtrip, found 1 day ago
$1,084
Roundtrip
found 1 day ago
Select Loganair flight, departing Thu, Sep 25 from Londonderry to Washington, returning Sun, Sep 28, priced at $1,084 found 1 day ago
Loganair
Thu, Sep 25 - Sun, Sep 28
LDY
Londonderry
IAD
Washington
$1,095 Roundtrip, found 1 day ago
$1,095
Roundtrip
found 1 day ago
Select Loganair flight, departing Thu, Sep 25 from Londonderry to Washington, returning Sun, Sep 28, priced at $1,095 found 1 day ago
Loganair
Thu, Sep 25 - Sun, Sep 28
LDY
Londonderry
IAD
Washington
$1,107 Roundtrip, found 1 day ago
$1,107
Roundtrip
found 1 day ago
Select Loganair flight, departing Thu, Sep 25 from Londonderry to Washington, returning Sun, Sep 28, priced at $1,107 found 1 day ago
Loganair
Thu, Sep 25 - Sun, Sep 28
LDY
Londonderry
IAD
Washington
$1,115 Roundtrip, found 1 day ago
$1,115
Roundtrip
found 1 day ago
Select Loganair flight, departing Thu, Sep 25 from Londonderry to Washington, returning Sun, Sep 28, priced at $1,115 found 1 day ago
Loganair
Thu, Sep 25 - Sun, Sep 28
LDY
Londonderry
IAD
Washington
$1,120 Roundtrip, found 1 day ago
$1,120
Roundtrip
found 1 day ago
Select Loganair flight, departing Thu, Sep 25 from Londonderry to Washington, returning Sun, Sep 28, priced at $1,120 found 1 day ago
Loganair
Thu, Sep 25 - Sun, Sep 28
LDY
Londonderry
IAD
Washington
$1,132 Roundtrip, found 1 day ago
$1,132
Roundtrip
found 1 day ago
Select Loganair flight, departing Thu, Sep 25 from Londonderry to Washington, returning Sun, Sep 28, priced at $1,132 found 1 day ago
Loganair
Thu, Sep 25 - Sun, Sep 28
LDY
Londonderry
IAD
Washington
$1,138 Roundtrip, found 1 day ago
$1,138
Roundtrip
found 1 day ago
Select Loganair flight, departing Thu, Sep 25 from Londonderry to Washington, returning Sun, Sep 28, priced at $1,138 found 1 day ago
Flights from Londonderry (LDY) to Washington (IAD)
Origin airport
City of Derry
Destination airport
Washington Dulles Intl.
Roundtrip price
$999
Distance
3335 mi

Londonderry to Washington Flights

The cheapest times to fly from Londonderry to Washington

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Londonderry to Washington are during the month of September. You can find some of the cheapest flights from Londonderry to Washington with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Londonderry to Washington

Sunday is one of the best days to book for cheap flights from Londonderry to Washington: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Londonderry to Washington

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Londonderry to Washington in 2025. You can also book with separate airlines for your outbound and return journeys, from $873 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Londonderry to Washington flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Londonderry to Washington airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from City of Derry Airport (LDY) to Washington Dulles Intl. Airport (IAD) cost?
Discover the latest flight deals from LDY to IAD by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from LDY to IAD?
The cheapest flights from LDY to IAD are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from LDY to IAD?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from LDY to IAD. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from City of Derry Airport (LDY) to Washington Dulles Intl. Airport (IAD)?
You'll have to book a flight with a layover if you're traveling from City of Derry Airport (LDY) to Washington Dulles Intl. Airport (IAD). Direct flights don't operate daily on this route. However, simply filter your search to include one or two stops to find the best option for your trip.
What day of the week has the most flights from LDY to IAD?
You'll typically find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can change from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from City of Derry Airport (LDY) to Washington Dulles Intl. Airport (IAD)?
To reach Washington Dulles Intl. Airport (IAD) without delays, select a flight that takes off from City of Derry Airport (LDY) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from City of Derry Airport (LDY) to Washington Dulles Intl. Airport (IAD) last-minute?
Last-minute bookings from LDY to IAD are typically more expensive. For the lowest rates, start looking for flights well ahead of time. That being said, if you're flexible with your travel dates, it's possible to find a cheap ticket just before your departure.
Is it cheaper to book a LDY to IAD flight and hotel package?
You'll generally save money by booking a LDY to IAD flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's easy to manage it all in one place. Once you've selected your ideal accommodations and flights, you can add extras such as car rentals, tours and activities.
Can I cancel or change the date of my flight from City of Derry Airport (LDY) to Washington Dulles Intl. Airport (IAD)?
If you booked your LDY to IAD flight in the last 24 hours, you may be able to cancel or modify it without fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal if you'd like more information.

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