AirHint found the following cheapest return flights from Cologne (CGN) to Keflavik (KEF) in December 2025 (see full year).
Return flights
| 23 Dec - 27 Dec | Eurowings | ||
| 26 Dec - 30 Dec | Ryanair | ||
| 28 Dec - 02 Jan | Ryanair | ||
| 25 Dec - 01 Jan | Lufthansa |
Also check the deals for one-way flights from Cologne to Keflavik in December.
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