AirHint found the following cheapest return flights from Monterrey (MTY) to Buenos Aires (AEP) in December 2025 (see full year).
Return flights
| 31 Dec - 07 Jan | Copa | ||
| 27 Dec - 07 Jan | Viva | ||
| 30 Dec - 04 Jan | Volaris | ||
| 29 Dec - 04 Jan | Volaris | ||
| 31 Dec - 03 Jan | Avianca | ||
| 29 Dec - 03 Jan | Avianca | ||
| 28 Dec - 03 Jan | Viva | ||
| 27 Dec - 30 Dec | Viva |
Also check the deals for one-way flights from Monterrey to Buenos Aires in December.
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