AirHint found the following cheapest return flights from Washington (IAD) to Zagreb (ZAG) in December 2025 (see full year).
Return flights
| 07 Dec - 13 Dec | Lufthansa | ||
| 04 Dec - 07 Dec | Lufthansa | ||
| 20 Dec - 13 Jan | Frontier Airlines | ||
| 18 Dec - 11 Jan | Air Canada | ||
| 19 Dec - 11 Jan | Aer Lingus |
Also check the deals for one-way flights from Washington to Zagreb in December.
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