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

Return flights

03 Dec - 05 Dec	Viva
03 Dec - 03 Dec	Viva
07 Dec - 08 Dec	Viva
08 Dec - 08 Dec	Viva
03 Dec - 08 Dec	Viva
03 Dec - 04 Dec	Viva
05 Dec - 05 Dec	Viva
01 Dec - 05 Dec	Viva
01 Dec - 01 Dec	Viva
01 Dec - 03 Dec	Viva
15 Dec - 05 Jan	Viva	direct
14 Dec - 04 Jan	Viva	direct
15 Dec - 04 Jan	Viva	direct
24 Dec - 09 Jan	Viva	direct
24 Dec - 11 Jan	Viva	direct
28 Dec - 09 Jan	Viva	direct
28 Dec - 11 Jan	Viva	direct
29 Dec - 09 Jan	Viva	direct
29 Dec - 11 Jan	Viva	direct
31 Dec - 09 Jan	Viva	direct

Also check the deals for one-way flights from Austin 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 Austin to Monterrey in December from $270

Return flights