AirHint found the following cheapest return flights from Chicago (MDW) to Buenos Aires (AEP) in December 2025 (see full year).
Return flights
| 03 Dec - 10 Dec | LATAM Airlines Group | ||
| 22 Dec - 19 Jan | LATAM Airlines Group | ||
| 19 Dec - 03 Jan | Frontier Airlines | ||
| 11 Dec - 06 Jan | Frontier Airlines |
Also check the deals for one-way flights from Chicago to Buenos Aires in December.
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