AirHint found the following cheapest return flights from Keflavik (KEF) to Athens (ATH) in December 2025 (see full year).
Return flights
| 10 Dec - 17 Dec | easyJet | ||
| 30 Dec - 10 Jan | easyJet | ||
| 14 Dec - 23 Dec | Wizz Air | ||
| 25 Dec - 28 Dec | Wizz Air | ||
| 18 Dec - 03 Jan | Wizz Air |
Also check the deals for one-way flights from Keflavik to Athens in December.
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