AirHint found the following cheapest return flights from Cagliari (CAG) to Keflavik (KEF) in December 2025 (see full year).
Return flights
| 19 Dec - 26 Dec | Ryanair | ||
| 27 Dec - 31 Dec | Aeroitalia | ||
| 28 Dec - 01 Jan | Ryanair | ||
| 29 Dec - 02 Jan | Ryanair | ||
| 31 Dec - 02 Jan | Ryanair |
Also check the deals for one-way flights from Cagliari to Keflavik in December.
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