Cheapest return flights from St. Louis to Frankfurt in September from $775

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

Return flights

10 Sep - 19 Sep Air Canada
02 Sep - 09 Sep United
17 Sep - 23 Sep Air Canada
21 Sep - 08 Oct Air Canada
23 Sep - 30 Sep United
17 Sep - 24 Sep United
05 Sep - 12 Sep United
10 Sep - 19 Sep Lufthansa direct
11 Sep - 18 Sep United
14 Sep - 21 Sep United
08 Sep - 15 Sep United
29 Sep - 06 Oct United
26 Sep - 03 Oct United
21 Sep - 08 Oct Lufthansa direct

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

Skyscanner

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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