AirHint found the following cheapest return flights from Atlanta (ATL) to Mexico City (MEX) in December 2025 (see full year).

Return flights

04 Dec - 17 Dec	Aeromexico
05 Dec - 17 Dec	Aeromexico
24 Dec - 07 Jan	Delta	direct
19 Dec - 26 Dec	Frontier Airlines
20 Dec - 03 Jan	Frontier Airlines
22 Dec - 03 Jan	Frontier Airlines
18 Dec - 29 Dec	Frontier Airlines
21 Dec - 04 Jan	Frontier Airlines
26 Dec - 02 Jan	Aeromexico
19 Dec - 19 Jan	Delta

Also check the deals for one-way flights from Atlanta to Mexico City 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 Mexico City in December from $470

Return flights