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

Return flights

09 Oct - 22 Oct	Viva
09 Oct - 12 Oct	Viva
09 Oct - 29 Oct	Viva
07 Oct - 12 Oct	Viva
01 Oct - 12 Oct	Viva
09 Oct - 23 Oct	Viva
01 Oct - 22 Oct	Viva
09 Oct - 16 Oct	Viva
09 Oct - 21 Oct	Viva
09 Oct - 14 Oct	Viva
22 Oct - 12 Nov	Viva
11 Oct - 01 Nov	Viva
21 Oct - 01 Nov	Viva
12 Oct - 01 Nov	Viva
22 Oct - 01 Nov	Viva
22 Oct - 11 Nov	Viva
21 Oct - 04 Nov	Viva
28 Oct - 16 Nov	Viva
27 Oct - 02 Nov	Volaris	direct
28 Oct - 01 Nov	Viva

Also check the deals for one-way flights from Chicago to Mexico City in October.

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 October from $204

Return flights