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

Return flights

31 Dec - 21 Jan	Viva
06 Dec - 09 Dec	Viva
07 Dec - 09 Dec	Viva
06 Dec - 10 Dec	Viva
07 Dec - 10 Dec	Viva
06 Dec - 15 Dec	Viva
07 Dec - 15 Dec	Viva
06 Dec - 12 Dec	Viva
07 Dec - 12 Dec	Viva
06 Dec - 11 Dec	Viva
06 Dec - 08 Dec	Viva
31 Dec - 20 Jan	Viva
31 Dec - 28 Jan	Volaris
31 Dec - 15 Jan	Volaris
31 Dec - 13 Jan	Volaris
12 Dec - 26 Jan	Frontier Airlines
31 Dec - 19 Jan	Viva
31 Dec - 16 Jan	Viva
31 Dec - 18 Jan	Viva
29 Dec - 11 Jan	Viva

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 249€

Return flights