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

Return flights

03 Dec - 09 Dec	Aeromexico
03 Dec - 10 Dec	Aeromexico
06 Dec - 09 Dec	Aeromexico
07 Dec - 30 Dec	Frontier Airlines
02 Dec - 16 Dec	Aeromexico
02 Dec - 09 Dec	Aeromexico
06 Dec - 07 Dec	Aeromexico
15 Dec - 12 Jan	Frontier Airlines
03 Dec - 11 Dec	Aeromexico
03 Dec - 08 Dec	Aeromexico
03 Dec - 24 Dec	Aeromexico
24 Dec - 15 Jan	Frontier Airlines
23 Dec - 15 Jan	Frontier Airlines
25 Dec - 10 Jan	Frontier Airlines
25 Dec - 06 Jan	Frontier Airlines
24 Dec - 28 Jan	Volaris
23 Dec - 02 Jan	Frontier Airlines
14 Dec - 08 Jan	Frontier Airlines
22 Dec - 09 Jan	Aeromexico
26 Dec - 16 Jan	Frontier Airlines

Also check the deals for one-way flights from Chicago 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 Chicago to Mexico City in December from $386

Return flights