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
03 Dec - 08 Dec	Wizz Air
06 Dec - 09 Dec	LOT
03 Dec - 09 Dec	LOT
03 Dec - 10 Dec	Wizz Air
05 Dec - 14 Jan	Wizz Air UK
07 Dec - 10 Dec	Ryanair
09 Dec - 15 Dec	easyJet
05 Dec - 10 Dec	Wizz Air UK
07 Dec - 09 Dec	easyJet
02 Dec - 08 Dec	Scandinavian Airlines
02 Dec - 07 Jan	SKY express
30 Dec - 07 Jan	Wizz Air
31 Dec - 08 Jan	Wizz Air UK
31 Dec - 07 Jan	Wizz Air UK
24 Dec - 01 Jan	LOT
30 Dec - 06 Jan	Wizz Air
25 Dec - 01 Jan	SKY express
31 Dec - 05 Jan	Wizz Air UK
28 Dec - 10 Jan	Aegean Airlines

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 $207

Return flights