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Cheap flights from St Louis (STL) to Klagenfurt (KLU)

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1 Adults (11+)
0 Children (2~11)
0 Infants (0~2)
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How to find the cheapest flight from St Louis (STL) to Klagenfurt (KLU)

How to find the cheapest flight from St Louis (STL) to Klagenfurt (KLU)
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How to find the cheapest flight from St Louis (STL) to Klagenfurt (KLU)
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How to find the cheapest flight from St Louis (STL) to Klagenfurt (KLU)
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Cheap flights from St Louis to Klagenfurt in September , October 2026

29 Sep - 22 Oct $ 1,580.00
STL
St Louis
Frontier Airlines
2 STOPS
KLU
Klagenfurt
KLU
Klagenfurt
Frontier Airlines
3 STOPS
STL
St Louis
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29 Sep - 23 Oct $ 1,723.00
STL
St Louis
Frontier Airlines
2 STOPS
KLU
Klagenfurt
KLU
Klagenfurt
Frontier Airlines
3 STOPS
STL
St Louis
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29 Sep - 16 Oct $ 1,850.00
STL
St Louis
Frontier Airlines
2 STOPS
KLU
Klagenfurt
KLU
Klagenfurt
Frontier Airlines
3 STOPS
STL
St Louis
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One-way flights to Klagenfurt from St Louis

2:40 PM - 9:45 AM
Sky Alps
2 Stops
37h 45m
STL - KLU
$ 767
Kiwi
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2:40 PM - 1:20 PM
Austrian Airlines
3 Stops
40h 20m
STL - KLU
$ 880
Kiwi
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2:40 PM - 1:25 PM
Eurowings
3 Stops
41h 15m
STL - KLU
$ 907
Kiwi
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How to find the cheapest flight from St Louis (STL) to Klagenfurt (KLU)

Related info for your journey
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How to find the cheapest flight from St Louis (STL) to Klagenfurt (KLU)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from St Louis (STL) to Klagenfurt (KLU)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.