AirHint found the following cheapest return flights from Denver (DEN) to Zurich (ZRH) in December 2025 (see full year).
Return flights
| 25 Dec - 26 Jan | Condor | ||
| 26 Dec - 17 Jan | Frontier Airlines | ||
| 27 Dec - 17 Jan | Frontier Airlines | ||
| 20 Dec - 10 Jan | Frontier Airlines | ||
| 26 Dec - 03 Jan | Turkish Airlines |
Also check the deals for one-way flights from Denver to Zurich in December.
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