AirHint found the following cheapest return flights from Chicago (MDW) to Zagreb (ZAG) in December 2025 (see full year).
Return flights
| 07 Dec - 14 Dec | Frontier Airlines | ||
| 30 Dec - 11 Jan | Frontier Airlines | ||
| 27 Dec - 01 Jan | Delta | ||
| 29 Dec - 05 Jan | Air France | ||
| 27 Dec - 04 Jan | Delta |
Also check the deals for one-way flights from Chicago to Zagreb in December.
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