$535 Cheap Flights from Washington (IAD) to Londonderry (LDY)

View $535 flight on Wed, Oct 1, 2025Opens in a new window

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

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Cheap Flights from Washington to Londonderry (IAD-LDY)

Prices were available within the past 7 days and start at $535 for one-way flights and $763 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Aer Lingus
Tue, Sep 30 - Wed, Oct 8
IAD
Washington
LDY
Londonderry
$763 Roundtrip, found 5 days ago
$763
Roundtrip
found 5 days ago
Select Aer Lingus flight, departing Tue, Sep 30 from Washington to Londonderry, returning Wed, Oct 8, priced at $763 found 5 days ago
Aer Lingus
Tue, Sep 30 - Fri, Oct 10
IAD
Washington
LDY
Londonderry
$784 Roundtrip, found 5 days ago
$784
Roundtrip
found 5 days ago
Select Aer Lingus flight, departing Tue, Sep 30 from Washington to Londonderry, returning Fri, Oct 10, priced at $784 found 5 days ago
Aer Lingus
Tue, Sep 30 - Tue, Oct 7
IAD
Washington
LDY
Londonderry
$807 Roundtrip, found 5 days ago
$807
Roundtrip
found 5 days ago
Select Aer Lingus flight, departing Tue, Sep 30 from Washington to Londonderry, returning Tue, Oct 7, priced at $807 found 5 days ago
United
Sun, Sep 28 - Sun, Oct 5
IAD
Washington
LDY
Londonderry
$832 Roundtrip, found 5 days ago
$832
Roundtrip
found 5 days ago
Select United flight, departing Sun, Sep 28 from Washington to Londonderry, returning Sun, Oct 5, priced at $832 found 5 days ago
United
Wed, Oct 1 - Mon, Oct 6
IAD
Washington
LDY
Londonderry
$835 Roundtrip, found 23 hours ago
$835
Roundtrip
found 23 hours ago
Select United flight, departing Wed, Oct 1 from Washington to Londonderry, returning Mon, Oct 6, priced at $835 found 23 hours ago
British Airways
Mon, Sep 1 - Sat, Sep 13
IAD
Washington
LDY
Londonderry
$895 Roundtrip, found 2 days ago
$895
Roundtrip
found 2 days ago
Select British Airways flight, departing Mon, Sep 1 from Washington to Londonderry, returning Sat, Sep 13, priced at $895 found 2 days ago
British Airways
Mon, Sep 1 - Sat, Sep 13
IAD
Washington
LDY
Londonderry
$902 Roundtrip, found 2 days ago
$902
Roundtrip
found 2 days ago
Select British Airways flight, departing Mon, Sep 1 from Washington to Londonderry, returning Sat, Sep 13, priced at $902 found 2 days ago
British Airways
Wed, Oct 1 - Mon, Oct 6
IAD
Washington
LDY
Londonderry
$905 Roundtrip, found 23 hours ago
$905
Roundtrip
found 23 hours ago
Select British Airways flight, departing Wed, Oct 1 from Washington to Londonderry, returning Mon, Oct 6, priced at $905 found 23 hours ago
British Airways
Thu, Sep 11 - Thu, Sep 18
IAD
Washington
LDY
Londonderry
$906 Roundtrip, found 3 days ago
$906
Roundtrip
found 3 days ago
Select British Airways flight, departing Thu, Sep 11 from Washington to Londonderry, returning Thu, Sep 18, priced at $906 found 3 days ago
British Airways
Mon, Sep 1 - Sat, Sep 13
IAD
Washington
LDY
Londonderry
$912 Roundtrip, found 2 days ago
$912
Roundtrip
found 2 days ago
Select British Airways flight, departing Mon, Sep 1 from Washington to Londonderry, returning Sat, Sep 13, priced at $912 found 2 days ago
Flights from Washington (IAD) to Londonderry (LDY)
Origin airport
Washington Dulles Intl.
Destination airport
City of Derry
Airlines serving
British Airways
Roundtrip price
$763
Distance
3335 mi

Washington to Londonderry Flights

The cheapest times to fly from Washington to Londonderry

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 Washington to Londonderry are during the month of September. You can find some of the cheapest flights from Washington to Londonderry with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to Londonderry

Sunday is one of the best days to book for cheap flights from Washington to Londonderry: 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 Washington to Londonderry

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 Washington to Londonderry in 2025. You can also book with separate airlines for your outbound and return journeys, from $535 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 Washington to Londonderry 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 Washington to Londonderry 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 Washington Dulles Intl. Airport (IAD) to City of Derry Airport (LDY) cost?
Discover the latest flight deals from IAD to LDY 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 IAD to LDY?
The cheapest flights from IAD to LDY 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 IAD to LDY?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from IAD to LDY. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Washington Dulles Intl. Airport (IAD) to City of Derry Airport (LDY)?
Nonstop flights from Washington Dulles Intl. Airport (IAD) to City of Derry Airport (LDY) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your travel dates and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from IAD to LDY?
You'll usually find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can vary from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Washington Dulles Intl. Airport (IAD) to City of Derry Airport (LDY)?
To touch down at City of Derry Airport (LDY) on schedule, select a flight that leaves from Washington Dulles Intl. Airport (IAD) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**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 Washington Dulles Intl. Airport (IAD) to City of Derry Airport (LDY) last-minute?
Booking your ticket from IAD to LDY just before your trip is usually more expensive. But if you're flexible with your departure times and dates, you could land a cheap last-minute fare.
Is it cheaper to book an IAD to LDY flight and hotel package?
Compared with arranging hotels and flights separately, booking an IAD to LDY flight and hotel package with Expedia could lead to significant savings. Better still, having it all in one place will take the stress out of planning your trip. Simply secure your flights and choose from our wide range of stays, then personalize your trip with other add-ons like tours, activities and car rentals.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to City of Derry Airport (LDY)?
In most cases, you can cancel or reschedule your IAD to LDY flight. However, additional fees may apply, especially if you booked over 24 hours ago. Double-check your itinerary for the airline's fees and rules on flight changes, or if you need more information, head to our Customer Service portal.

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