AirHint found the following cheapest return flights from Denver (DEN) to Frankfurt (FRA) in December 2025 (see full year).
Return flights
| 29 Dec - 13 Jan | Air France | ||
| 26 Dec - 08 Jan | Frontier Airlines | ||
| 30 Dec - 06 Jan | Frontier Airlines | ||
| 26 Dec - 08 Jan | Lufthansa | direct | |
| 29 Dec - 13 Jan | Lufthansa | direct |
Also check the deals for one-way flights from Denver to Frankfurt in December.
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