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

Return flights

14 Sep - 23 Sep	Frontier Airlines
24 Sep - 08 Oct	Spirit Airlines
28 Sep - 05 Oct	Spirit Airlines
25 Sep - 02 Oct	Spirit Airlines
24 Sep - 02 Oct	Spirit Airlines
28 Sep - 03 Oct	Frontier Airlines
26 Sep - 03 Oct	Frontier Airlines
24 Sep - 02 Oct	Delta	direct
24 Sep - 08 Oct	Delta	direct
14 Sep - 23 Sep	Delta	direct
26 Sep - 03 Oct	Delta	direct
28 Sep - 05 Oct	Delta	direct
06 Sep - 12 Sep	Delta	direct
01 Sep - 07 Sep	Delta

Also check the deals for one-way flights from Atlanta to Buenos Aires 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 Buenos Aires in September from 673€

Return flights