AirHint found the following cheapest return flights from Chicago (MDW) to Monterrey (MTY) in December 2025 (see full year).
Return flights
| 09 Dec - 29 Jan | Frontier Airlines | ||
| 31 Dec - 08 Jan | Aeromexico | ||
| 18 Dec - 05 Jan | Frontier Airlines | ||
| 21 Dec - 03 Jan | Frontier Airlines | ||
| 22 Dec - 03 Jan | Frontier Airlines |
Also check the deals for one-way flights from Chicago to Monterrey in December.
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