$568 Cheap Flights from Washington (IAD) to Lille (LIL)

View $568 flight on Mon, Jan 26, 2026Opens in a new window

Popular airlines from Washington Dulles Intl. Airport (IAD) to Lille (LIL-Lesquin)

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Cheap Flights from Washington to Lille (IAD-LIL)

Prices were available within the past 7 days and start at $568 for one-way flights and $2,428 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Turkish Airlines
Wed, Dec 24 - Wed, Jan 7
IAD
Washington
LIL
Lille
$2,428 Roundtrip, found 4 hours ago
$2,428
Roundtrip
found 4 hours ago
Select Turkish Airlines flight, departing Wed, Dec 24 from Washington to Lille, returning Wed, Jan 7, priced at $2,428 found 4 hours ago

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Flights from Washington (IAD) to Lille (LIL)
Origin airport
Washington Dulles Intl.
Destination airport
Lesquin
Roundtrip price
$2,428
Distance
3833 mi

Washington to Lille Flights

The cheapest times to fly from Washington to Lille

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

 

The best time to book a flight from Washington to Lille

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

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 Lille in 2025. You can also book with separate airlines for your outbound and return journeys, from $568 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 Lille 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 Lille 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 Lesquin Airport (LIL) cost?
Snag a cheap one-way flight from $568 or cheap return flight from $2,428 from Washington Dulles Intl. Airport (IAD) to Lesquin Airport (LIL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Washington Dulles Intl. Airport (IAD) to Lesquin Airport (LIL)?
Flying in December is a good way to save, as it's the cheapest month for flights between IAD and LIL. You'll typically find the lowest prices during off-peak months.
What is the cheapest airline that flies from Washington Dulles Intl. Airport (IAD) to Lesquin Airport (LIL)?
Expedia's filter tool lets you easily compare travel time, airlines and fares all in one place. Customize the search to your preferences, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest IAD to LIL flight.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Lesquin Airport (LIL)?
There aren't any daily nonstop flights departing from Washington Dulles Intl. Airport (IAD) to Lesquin Airport (LIL). But you can book flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be on your way in no time.
What day of the week has the most flights from IAD to LIL?
Typically you'll find the largest variety of flight choices on a Friday. Tuesdays are often the quietest.* However, this can change based on the airline, season and other factors.*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 Lesquin Airport (LIL)?
To touch down at Lesquin Airport (LIL) on schedule, choose a flight that takes off from Washington Dulles Intl. Airport (IAD) before 3 PM. The likelihood 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 Lesquin Airport (LIL) last-minute?
Booking your ticket from IAD to LIL shortly before your trip is usually more expensive. However, if you're flexible with your travel dates and times, you could grab a cheap last-minute fare.
Is it cheaper to book an IAD to LIL flight and hotel package?
Opting for an IAD to LIL flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip in one place. Select from our impressive range of accommodations and then add activities, flights and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to Lesquin Airport (LIL)?
In most instances, you can cancel or reschedule your IAD to LIL flight. However, there may be additional charges, especially if you made your booking over 24 hours ago. Double-check your itinerary for the airline's fees and rules on flight changes, or if you need further information, head to our Customer Service portal.

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*Available to One Key members.