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

Return flights

29 Sep - 20 Oct	Viva	direct
28 Sep - 29 Sep	Viva	direct
29 Sep - 06 Oct	Viva	direct
29 Sep - 01 Oct	Viva
29 Sep - 01 Oct	Viva	direct
24 Sep - 29 Sep	Viva	direct
24 Sep - 06 Oct	Viva	direct
29 Sep - 08 Oct	Viva	direct
29 Sep - 12 Oct	Viva	direct
28 Sep - 01 Oct	Viva	direct
24 Sep - 01 Oct	Viva	direct
24 Sep - 26 Sep	Viva	direct
28 Sep - 08 Oct	Viva	direct
22 Sep - 29 Sep	Viva	direct
24 Sep - 28 Sep	Viva	direct
26 Sep - 29 Sep	Viva	direct
22 Sep - 26 Sep	Viva	direct
22 Sep - 24 Sep	Viva	direct
21 Sep - 29 Sep	Viva	direct
22 Sep - 28 Sep	Viva	direct

Also check the deals for one-way flights from Austin 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 Austin to Monterrey in September from $225

Return flights