AirHint found the following cheapest return flights from St. Louis (STL) to Vienna (VIE) in July 2025 (see full year).

Return flights

21 Jul - 24 Aug	Delta
28 Jul - 24 Aug	United
30 Jul - 24 Aug	Delta
29 Jul - 24 Aug	Delta
21 Jul - 09 Aug	Air Canada
14 Jul - 23 Jul	Spirit Airlines
21 Jul - 10 Aug	Delta
04 Jul - 29 Aug	Frontier Airlines
27 Jul - 03 Aug	Delta
16 Jul - 05 Aug	Spirit Airlines
20 Jul - 25 Jul	Frontier Airlines
05 Jul - 25 Jul	Frontier Airlines
13 Jul - 25 Jul	Frontier Airlines
06 Jul - 25 Jul	Frontier Airlines
04 Jul - 25 Jul	Frontier Airlines
27 Jul - 28 Jul	Lufthansa

Also check the deals for one-way flights from St. Louis to Vienna in July.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from St. Louis to Vienna in July from $726

Return flights