AirHint found the following cheapest return flights from Chicago (MDW) to Zagreb (ZAG) in December 2025 (see full year).
Return flights
| 16 Dec - 07 Jan | Frontier Airlines | ||
| 18 Dec - 08 Jan | Delta | ||
| 15 Dec - 05 Jan | Delta | ||
| 17 Dec - 07 Jan | Delta |
Also check the deals for one-way flights from Chicago to Zagreb in December.
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