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

Return flights

31 Dec - 11 Jan	Frontier Airlines
24 Dec - 29 Dec	Delta
24 Dec - 01 Jan	Delta
24 Dec - 28 Dec	Aeromexico
31 Dec - 31 Jan	Frontier Airlines
25 Dec - 31 Dec	Frontier Airlines
24 Dec - 30 Dec	Aeromexico
24 Dec - 04 Jan	Aeromexico
27 Dec - 31 Dec	Frontier Airlines
29 Dec - 02 Jan	Aeromexico
22 Dec - 12 Jan	Frontier Airlines
22 Dec - 09 Jan	Frontier Airlines
24 Dec - 24 Dec	Aeromexico
23 Dec - 03 Jan	Frontier Airlines
27 Dec - 03 Jan	Frontier Airlines
24 Dec - 27 Dec	Delta
23 Dec - 28 Dec	Volaris
28 Dec - 30 Dec	Frontier Airlines
29 Dec - 06 Jan	Aeromexico
28 Dec - 31 Dec	Delta

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.

Book a cheap hotel in Mexico City

Cheap car rent in Mexico City

Cheapest return flights from Chicago to Mexico City in December from 452€

Return flights