AirHint found the following cheapest return flights from St. Louis (STL) to Zurich (ZRH) in August 2025 (see full year).

Return flights

19 Aug - 26 Aug	Air Canada
14 Aug - 21 Aug	United
18 Aug - 25 Aug	United
20 Aug - 27 Aug	United
12 Aug - 19 Aug	United
26 Aug - 02 Sep	United
16 Aug - 23 Aug	United
24 Aug - 31 Aug	United
06 Aug - 13 Aug	United
22 Aug - 29 Aug	United
10 Aug - 17 Aug	United
29 Aug - 05 Sep	United

Also check the deals for one-way flights from St. Louis to Zurich in August.

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 Zurich in August from $586

Return flights