$650 Cheap Flights from St. Louis (STL) to Klagenfurt (KLU)

View $650 flight on Sun, Oct 26, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Klagenfurt (KLU-Woerthersee)

Cheap Flights from St. Louis to Klagenfurt (STL-KLU)

Prices were available within the past 7 days and start at $650 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alternative airports near Klagenfurt am Woerthersee

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Joze Pucnik LJU. Cheapest option available. Average driving time to city center is 55 minutes. Flights from $904
LJU
Joze Pucnik
Cheapest
Average driving time to city center55 min
Flights from $904
Flights from St. Louis (STL) to Klagenfurt (KLU)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Woerthersee
Distance
4931 mi

St. Louis to Klagenfurt Flights

The cheapest times to fly from St. Louis to Klagenfurt

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

 

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

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

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 Klagenfurt in 2025. You can also book with separate airlines for your outbound and return journeys, from $650 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 Klagenfurt 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 Klagenfurt 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 Woerthersee Airport (KLU) cost?
Lock in a cheap one-way flight from $650 or cheap return flight from Lambert-St. Louis Intl. Airport (STL) to Woerthersee Airport (KLU) 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 Woerthersee Airport (KLU)?
Planning your getaway for may help you find better deals, as it's the cheapest month for flights between STL and KLU. You'll often find the lowest fares during the off-season.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Woerthersee Airport (KLU)?
To find the cheapest airline flying from STL to KLU, use Expedia's filter tool. Tailor your search based on your travel style, such as preferred carriers and flight duration. You can then sort your results by "Price (lowest to highest)" to list the most affordable options first.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Woerthersee Airport (KLU)?
You'll have to book a flight with a layover if you're traveling from Lambert-St. Louis Intl. Airport (STL) to Woerthersee Airport (KLU). There are no daily direct flights on this route. However, just filter your search to include one or more stops to find an option that works for you.
What day of the week has the most flights from STL to KLU?
Usually you'll find the greatest selection of flight options on a Friday. Tuesdays tend to be the quietest.* But this can vary depending on the time of year, carrier 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 Lambert-St. Louis Intl. Airport (STL) to Woerthersee Airport (KLU)?
Choose a flight from Lambert-St. Louis Intl. Airport (STL) to Woerthersee Airport (KLU) that leaves before 3 PM to reduce the likelihood of delays. Departures later than this have a 22% higher chance of being canceled, on average.**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 Woerthersee Airport (KLU) last-minute?
Booking your flight from STL to KLU just before your getaway is typically more expensive. However, if there's some wiggle room with your schedule, you could land a cheap last-minute fare.
Is it cheaper to book a STL to KLU flight and hotel package?
Compared with arranging flights and hotels separately, booking a STL to KLU flight and hotel package with Expedia could lead to significant savings. Better still, having it all in one place takes the hassle out of travel planning. Simply secure your flights and choose from our wide range of stays, then personalize your trip with other add-ons like activities and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Woerthersee Airport (KLU)?
If you reserved your STL to KLU flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the ticket type you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal for further details.

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*Available to One Key members.