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

Return flights

06 Dec - 13 Dec	Delta
06 Dec - 15 Dec	Viva
06 Dec - 10 Dec	Viva
06 Dec - 19 Dec	Viva
06 Dec - 20 Dec	Viva
10 Dec - 15 Dec	Viva
10 Dec - 13 Dec	Viva
06 Dec - 16 Dec	Viva
10 Dec - 19 Dec	Viva
06 Dec - 15 Dec	Viva	direct
14 Dec - 02 Jan	Viva
14 Dec - 03 Jan	Viva
14 Dec - 04 Jan	Viva
12 Dec - 02 Jan	Viva
25 Dec - 02 Jan	Viva
14 Dec - 03 Jan	Viva	direct
25 Dec - 03 Jan	Viva
25 Dec - 04 Jan	Viva
14 Dec - 02 Jan	Viva	direct
12 Dec - 02 Jan	Viva	direct

Also check the deals for one-way flights from Chicago to Monterrey 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 Monterrey in December from 251€

Return flights