AirHint found the following cheapest return flights from Houston (HOU) to Zagreb (ZAG) in December 2025 (see full year).
Return flights
| 25 Dec - 18 Jan | Lufthansa | ||
| 24 Dec - 11 Jan | Frontier Airlines | ||
| 24 Dec - 10 Jan | Frontier Airlines | ||
| 23 Dec - 04 Jan | Spirit Airlines |
Also check the deals for one-way flights from Houston to Zagreb in December.
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