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

Return flights

16 Oct - 20 Oct	Viva	direct
02 Oct - 22 Oct	Viva	direct
02 Oct - 21 Oct	Viva	direct
16 Oct - 24 Oct	Viva	direct
02 Oct - 15 Oct	Viva	direct
02 Oct - 19 Oct	Viva	direct
16 Oct - 22 Oct	Viva	direct
16 Oct - 21 Oct	Viva	direct
16 Oct - 28 Oct	Viva	direct
16 Oct - 01 Nov	Viva	direct
02 Oct - 20 Oct	Viva	direct
16 Oct - 02 Nov	Viva	direct
25 Oct - 01 Nov	Viva	direct
21 Oct - 01 Nov	Viva	direct
22 Oct - 01 Nov	Viva	direct
25 Oct - 08 Nov	Viva	direct
21 Oct - 08 Nov	Viva	direct
22 Oct - 08 Nov	Viva	direct
25 Oct - 07 Nov	Viva	direct
25 Oct - 12 Nov	Viva	direct

Also check the deals for one-way flights from Chicago to Monterrey 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 Monterrey in October from $229

Return flights