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

Return flights

18 Aug - 13 Sep	Frontier Airlines
30 Aug - 20 Sep	Frontier Airlines
23 Aug - 05 Sep	Frontier Airlines
29 Aug - 06 Sep	Spirit Airlines
28 Aug - 20 Sep	Spirit Airlines
29 Aug - 07 Sep	Spirit Airlines
20 Aug - 27 Aug	Delta
19 Aug - 27 Aug	KLM

Also check the deals for one-way flights from St. Louis to Athens 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 Athens in August from 764€

Return flights