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

Return flights

08 Sep - 19 Sep	United
03 Sep - 10 Sep	United
09 Sep - 16 Sep	United
10 Sep - 17 Sep	United
05 Sep - 12 Sep	United
11 Sep - 18 Sep	United
07 Sep - 14 Sep	United
01 Sep - 08 Sep	United
24 Sep - 01 Oct	United
30 Sep - 07 Oct	United
16 Sep - 14 Oct	United
13 Sep - 20 Sep	United
16 Sep - 04 Oct	Hawaiian Airlines
18 Sep - 25 Sep	United
29 Sep - 05 Oct	United
27 Sep - 04 Oct	United
26 Sep - 06 Oct	United

Also check the deals for one-way flights from St. Louis to Paris 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 Paris in September from 622€

Return flights