$438 Cheap Flights from St. Louis (STL) to Lille (LIL)

View $438 flight on Mon, Sep 1, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Lille (LIL-Lesquin)

Cheap Flights from St. Louis to Lille (STL-LIL)

Prices were available within the past 7 days and start at $438 for one-way flights and $973 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Thu, Oct 23 - Sun, Oct 26
STL
St. Louis
XDB
Lille
$973 Roundtrip, found 6 days ago
$973
Roundtrip
found 6 days ago
Select Air Canada flight, departing Thu, Oct 23 from St. Louis to Lille, returning Sun, Oct 26, priced at $973 found 6 days ago
Air Canada
Thu, Oct 23 - Sun, Oct 26
STL
St. Louis
XDB
Lille
$1,033 Roundtrip, found 6 days ago
$1,033
Roundtrip
found 6 days ago
Select Air Canada flight, departing Thu, Oct 23 from St. Louis to Lille, returning Sun, Oct 26, priced at $1,033 found 6 days ago
Air Canada
Thu, Oct 23 - Sun, Oct 26
STL
St. Louis
XDB
Lille
$1,173 Roundtrip, found 6 days ago
$1,173
Roundtrip
found 6 days ago
Select Air Canada flight, departing Thu, Oct 23 from St. Louis to Lille, returning Sun, Oct 26, priced at $1,173 found 6 days ago
Air Canada
Thu, Oct 23 - Sun, Oct 26
STL
St. Louis
XDB
Lille
$1,233 Roundtrip, found 6 days ago
$1,233
Roundtrip
found 6 days ago
Select Air Canada flight, departing Thu, Oct 23 from St. Louis to Lille, returning Sun, Oct 26, priced at $1,233 found 6 days ago
Air Canada
Thu, Oct 23 - Sun, Oct 26
STL
St. Louis
XDB
Lille
$1,373 Roundtrip, found 6 days ago
$1,373
Roundtrip
found 6 days ago
Select Air Canada flight, departing Thu, Oct 23 from St. Louis to Lille, returning Sun, Oct 26, priced at $1,373 found 6 days ago
Air Canada
Thu, Oct 23 - Sun, Oct 26
STL
St. Louis
XDB
Lille
$1,403 Roundtrip, found 6 days ago
$1,403
Roundtrip
found 6 days ago
Select Air Canada flight, departing Thu, Oct 23 from St. Louis to Lille, returning Sun, Oct 26, priced at $1,403 found 6 days ago
Flights from St. Louis (STL) to Lille (XDB)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Lille Europe TGV Train Station
Roundtrip price
$973
Distance
4351 mi

St. Louis to Lille Flights

The cheapest times to fly from St. Louis 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 St. Louis to Lille are during the month of October. You can find some of the cheapest flights from St. Louis to Lille with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Lille

Sunday is one of the best days to book for cheap flights from St. Louis 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 St. Louis 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 St. Louis to Lille in 2025. You can also book with separate airlines for your outbound and return journeys, from $438 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 St. Louis 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 St. Louis 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 Lambert-St. Louis Intl. Airport (STL) to Lesquin Airport (LIL) cost?
Discover the latest flight deals from STL to LIL 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 STL to LIL?
The cheapest flights from STL to LIL 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 STL to LIL?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from STL to LIL. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Lesquin Airport (LIL)?
Direct flights from Lambert-St. Louis Intl. Airport (STL) to Lesquin Airport (LIL) aren't available daily, so you'll need to take a flight with a layover. Explore your options with our filter tool. Enter your travel dates and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from STL to LIL?
Friday is generally the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can vary based on various factors, such as the airline and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Lesquin Airport (LIL)?
Opt for a flight from Lambert-St. Louis Intl. Airport (STL) to Lesquin Airport (LIL) that takes off before 3 PM to reduce the risk of delays and cancellations. Later departures are on average 22% more likely to be canceled.**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 Lambert-St. Louis Intl. Airport (STL) to Lesquin Airport (LIL) last-minute?
Booking your ticket from STL to LIL right before your journey is usually more expensive. However, if there's some wiggle room with your departure dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a STL to LIL flight and hotel package?
Compared with arranging hotels and flights separately, booking a STL to LIL flight and hotel package with Expedia could result in significant savings. Better still, having it all in one place takes the hassle out of travel planning. Simply pick your flights and choose from our wide range of stays, then personalize your trip with extras like activities, tours and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Lesquin Airport (LIL)?
In most instances, you can reschedule or cancel your STL to LIL flight. However, there may be additional charges, especially if you booked more than 24 hours ago. Check your itinerary for the airline's policies and fees on flight changes, or if you need more details, go to our Customer Service portal.

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*Available to One Key members.