AirHint found the following cheapest return flights from Boston (BOS) to Zagreb (ZAG) in December 2025 (see full year).
Return flights
| 04 Dec - 18 Dec | KLM | ||
| 26 Dec - 09 Jan | Scandinavian Airlines | ||
| 23 Dec - 06 Jan | Icelandair | ||
| 10 Dec - 03 Jan | Icelandair | ||
| 21 Dec - 28 Dec | Aer Lingus | ||
| 19 Dec - 04 Jan | Icelandair |
Also check the deals for one-way flights from Boston to Zagreb in December.
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