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

Return flights

30 Sep - 15 Oct	Viva	direct
30 Sep - 19 Oct	Viva	direct
30 Sep - 14 Oct	Viva	direct
30 Sep - 20 Oct	Viva	direct
30 Sep - 03 Oct	Viva	direct
30 Sep - 07 Oct	Viva	direct
30 Sep - 16 Oct	Viva	direct
30 Sep - 18 Oct	Viva	direct
30 Sep - 01 Oct	Viva	direct
30 Sep - 04 Oct	Viva	direct
26 Sep - 28 Sep	Viva	direct
27 Sep - 28 Sep	Viva	direct
25 Sep - 26 Sep	Viva	direct
25 Sep - 27 Sep	Viva	direct
28 Sep - 29 Sep	Viva	direct
26 Sep - 27 Sep	Viva	direct
24 Sep - 26 Sep	Viva	direct
24 Sep - 27 Sep	Viva	direct
24 Sep - 28 Sep	Viva	direct
26 Sep - 29 Sep	Viva	direct

Also check the deals for one-way flights from Chicago to Monterrey in September.

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 September from $271

Return flights