AirHint found the following cheapest return flights from Athens (ATH) to Keflavik (KEF) in December 2025 (see full year).

Return flights

03 Dec - 07 Dec	Wizz Air UK
01 Dec - 07 Dec	Wizz Air UK
01 Dec - 05 Dec	Wizz Air UK
01 Dec - 06 Dec	Wizz Air UK
06 Dec - 13 Dec	easyJet
03 Dec - 13 Dec	easyJet
10 Dec - 13 Dec	easyJet
08 Dec - 13 Dec	Wizz Air UK
08 Dec - 12 Dec	Wizz Air UK
06 Dec - 12 Dec	Wizz Air UK
17 Dec - 05 Jan	SKY express
31 Dec - 05 Jan	Wizz Air UK
30 Dec - 07 Jan	easyJet
30 Dec - 08 Jan	Wizz Air UK
22 Dec - 04 Jan	Wizz Air
24 Dec - 04 Jan	Wizz Air
24 Dec - 01 Jan	Wizz Air
29 Dec - 06 Jan	Scandinavian Airlines
30 Dec - 05 Jan	Wizz Air UK
30 Dec - 06 Jan	Wizz Air UK

Also check the deals for one-way flights from Athens to Keflavik in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Athens to Keflavik in December from $179

Return flights