$440 Cheap Flights from St. Louis (STL) to Luxembourg (LUX)

View $440 flight on Mon, Jan 26, 2026Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Findel International Airport (LUX)

    notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
    deals illustration

    Book smarter

    Save up to 30% on select hotels after you book a flight*
    trophy illustration

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from St. Louis to Luxembourg (STL-LUX)

Prices were available within the past 7 days and start at $440 for one-way flights and $556 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Lufthansa
Sun, Dec 7 - Tue, Dec 23
STL
St. Louis
LUX
Luxembourg
$556 Roundtrip, found 2 days ago
$556
Roundtrip
found 2 days ago
Select Lufthansa flight, departing Sun, Dec 7 from St. Louis to Luxembourg, returning Tue, Dec 23, priced at $556 found 2 days ago
Air Canada
Mon, Dec 8 - Tue, Dec 23
STL
St. Louis
LUX
Luxembourg
$558 Roundtrip, found 2 days ago
$558
Roundtrip
found 2 days ago
Select Air Canada flight, departing Mon, Dec 8 from St. Louis to Luxembourg, returning Tue, Dec 23, priced at $558 found 2 days ago
Lufthansa
Mon, Dec 8 - Tue, Dec 23
STL
St. Louis
LUX
Luxembourg
$562 Roundtrip, found 2 days ago
$562
Roundtrip
found 2 days ago
Select Lufthansa flight, departing Mon, Dec 8 from St. Louis to Luxembourg, returning Tue, Dec 23, priced at $562 found 2 days ago
British Airways
Mon, Dec 8 - Tue, Dec 23
STL
St. Louis
LUX
Luxembourg
$573 Roundtrip, found 2 days ago
$573
Roundtrip
found 2 days ago
Select British Airways flight, departing Mon, Dec 8 from St. Louis to Luxembourg, returning Tue, Dec 23, priced at $573 found 2 days ago
Lufthansa
Mon, Dec 8 - Tue, Dec 23
STL
St. Louis
LUX
Luxembourg
$575 Roundtrip, found 2 days ago
$575
Roundtrip
found 2 days ago
Select Lufthansa flight, departing Mon, Dec 8 from St. Louis to Luxembourg, returning Tue, Dec 23, priced at $575 found 2 days ago
United
Wed, Mar 4 - Wed, Mar 11
STL
St. Louis
LUX
Luxembourg
$575 Roundtrip, found 6 days ago
$575
Roundtrip
found 6 days ago
Select United flight, departing Wed, Mar 4 from St. Louis to Luxembourg, returning Wed, Mar 11, priced at $575 found 6 days ago
United
Sun, Mar 1 - Wed, Mar 11
STL
St. Louis
LUX
Luxembourg
$583 Roundtrip, found 6 days ago
$583
Roundtrip
found 6 days ago
Select United flight, departing Sun, Mar 1 from St. Louis to Luxembourg, returning Wed, Mar 11, priced at $583 found 6 days ago
United
Tue, Mar 3 - Tue, Mar 10
STL
St. Louis
LUX
Luxembourg
$584 Roundtrip, found 6 days ago
$584
Roundtrip
found 6 days ago
Select United flight, departing Tue, Mar 3 from St. Louis to Luxembourg, returning Tue, Mar 10, priced at $584 found 6 days ago
United
Wed, Mar 4 - Thu, Mar 12
STL
St. Louis
LUX
Luxembourg
$585 Roundtrip, found 6 days ago
$585
Roundtrip
found 6 days ago
Select United flight, departing Wed, Mar 4 from St. Louis to Luxembourg, returning Thu, Mar 12, priced at $585 found 6 days ago
American Airlines
Tue, Mar 3 - Tue, Mar 10
STL
St. Louis
LUX
Luxembourg
$587 Roundtrip, found 6 days ago
$587
Roundtrip
found 6 days ago
Select American Airlines flight, departing Tue, Mar 3 from St. Louis to Luxembourg, returning Tue, Mar 10, priced at $587 found 6 days ago

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Findel Airport (LUX) cost?
Grab a cheap one-way flight from $440 or cheap return flight from $556 from Lambert-St. Louis Intl. Airport (STL) to Findel Airport (LUX) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Findel Airport (LUX)?
Traveling in December can help you save, as it's the cheapest month for flights between STL and LUX. You'll usually find the lowest prices during off-peak months.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Findel Airport (LUX)?
Expedia's filter tool lets you easily compare airlines, flight times 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 STL to LUX flight.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Findel Airport (LUX)?
There are no daily direct flights departing from Lambert-St. Louis Intl. Airport (STL) to Findel Airport (LUX). But you can choose flights with layovers. Filter your search results on Expedia to include one or more stops, and you'll be soaring above the clouds before you know it.
What day of the week has the most flights from STL to LUX?
You'll usually find Tuesday the quietest day for flights, while Fridays tend to be 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 Lambert-St. Louis Intl. Airport (STL) to Findel Airport (LUX)?
To land at Findel Airport (LUX) without delays, opt for a flight that leaves from Lambert-St. Louis Intl. Airport (STL) 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 Lambert-St. Louis Intl. Airport (STL) to Findel Airport (LUX) last-minute?
Waiting until right before your break to book a flight from STL to LUX often results in higher prices. While you may find some last-minute deals, they aren't always guaranteed. Be flexible with your travel plans for a better chance of landing a bargain.
Is it cheaper to book a STL to LUX flight and hotel package?
Compared with arranging hotels and flights separately, booking a STL to LUX flight and hotel package with Expedia could lead to significant savings. What's more, having everything in one place will take the stress out of planning your trip. Just secure your flights and choose from our extensive range of hotels, then personalize your trip with other add-ons like tours, car rentals and activities.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Findel Airport (LUX)?
It's usually possible to cancel or reschedule your STL to LUX flight. However, for bookings made more than 24 hours ago, additional charges may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find more information on our Customer Service portal.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Findel
Airlines serving
Air Canada, American Airlines, Austrian Airlines, British Airways, Delta, KLM, Lufthansa, Scandinavian Airlines, United
Roundtrip price
$555
Distance
4506 mi

Book with confidence

St. Louis to Luxembourg Flights

The cheapest times to fly from St. Louis to Luxembourg

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

 

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

Sunday is one of the best days to book for cheap flights from St. Louis to Luxembourg: 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 Luxembourg

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 Luxembourg in 2025. You can also book with separate airlines for your outbound and return journeys, from $440 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 Luxembourg 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 Luxembourg 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.

 

St. Louis to Luxembourg Flights

Explore a world of travel with Expedia

*Available to One Key members.