AirHint found the following cheapest return flights from Prestwick (PIK) to Keflavik (KEF) in December 2025 (see full year).
Return flights
| 06 Dec - 07 Dec | Ryanair | ||
| 14 Dec - 17 Dec | Ryanair | ||
| 08 Dec - 13 Dec | Ryanair |
Also check the deals for one-way flights from Prestwick to Keflavik in December.
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