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

Return flights

11 Aug - 19 Aug	Finnair
19 Aug - 26 Aug	Finnair
20 Aug - 30 Aug	Finnair
27 Aug - 31 Aug	Finnair
28 Aug - 02 Sep	Finnair
12 Aug - 19 Aug	United
17 Aug - 27 Aug	Air Canada
27 Aug - 03 Sep	United
20 Aug - 27 Aug	United
26 Aug - 02 Sep	United
28 Aug - 31 Aug	Finnair
29 Aug - 01 Sep	Finnair
28 Aug - 01 Sep	Finnair
14 Aug - 21 Aug	United
18 Aug - 25 Aug	United
28 Aug - 04 Sep	United
31 Aug - 03 Sep	Frontier Airlines
31 Aug - 03 Sep	Lufthansa	direct

Also check the deals for one-way flights from St. Louis to Frankfurt 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 Frankfurt in August from 520€

Return flights