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

Return flights

13 Dec - 27 Dec	Frontier Airlines
14 Dec - 20 Dec	Frontier Airlines
31 Dec - 14 Jan	LATAM Airlines Group
15 Dec - 12 Jan	Frontier Airlines
12 Dec - 11 Jan	Frontier Airlines
31 Dec - 17 Jan	Frontier Airlines
19 Dec - 27 Dec	LATAM Airlines Group
28 Dec - 17 Jan	Air Canada

Also check the deals for one-way flights from Atlanta to Buenos Aires in December.

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 December from $1092

Return flights