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

Return flights

09 Sep - 16 Sep	United
05 Sep - 12 Sep	United
11 Sep - 18 Sep	United
22 Sep - 06 Oct	Scandinavian Airlines
07 Sep - 14 Sep	United
12 Sep - 26 Sep	United
29 Sep - 06 Oct	Austrian Airlines
23 Sep - 30 Sep	United
13 Sep - 20 Sep	United
25 Sep - 02 Oct	United
15 Sep - 22 Sep	United
21 Sep - 11 Oct	United
21 Sep - 28 Sep	United
17 Sep - 24 Sep	United

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

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 September from 573€

Return flights