AirHint found the following cheapest return flights from Atlanta (ATL) to Athens (ATH) in September 2025 (see full year).

Return flights

23 Sep - 26 Sep	Frontier Airlines
15 Sep - 26 Sep	Frontier Airlines
20 Sep - 26 Sep	Spirit Airlines
20 Sep - 07 Oct	Frontier Airlines
19 Sep - 24 Sep	Frontier Airlines
19 Sep - 26 Sep	Frontier Airlines
18 Sep - 26 Sep	Frontier Airlines
03 Sep - 12 Sep	Spirit Airlines
04 Sep - 12 Sep	Frontier Airlines
25 Sep - 08 Oct	Spirit Airlines
10 Sep - 20 Sep	Spirit Airlines
20 Sep - 27 Sep	Scandinavian Airlines
25 Sep - 14 Oct	Delta

Also check the deals for one-way flights from Atlanta to Athens 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 Atlanta to Athens in September from 404€

Return flights