AirHint found the following cheapest return flights from Atlanta (ATL) to Zagreb (ZAG) in December 2025 (see full year).
Return flights
| 13 Dec - 05 Jan | Spirit Airlines | ||
| 16 Dec - 23 Dec | Lufthansa | ||
| 09 Dec - 04 Jan | Frontier Airlines | ||
| 20 Dec - 10 Jan | Frontier Airlines | ||
| 19 Dec - 10 Jan | Frontier Airlines |
Also check the deals for one-way flights from Atlanta to Zagreb in December.
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