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

Return flights

10 Dec - 17 Dec	easyJet
08 Dec - 12 Dec	Wizz Air UK
10 Dec - 12 Dec	Wizz Air UK
06 Dec - 12 Dec	Wizz Air UK
09 Dec - 12 Dec	Wizz Air UK
03 Dec - 05 Dec	Wizz Air UK
01 Dec - 10 Dec	Wizz Air UK
11 Dec - 16 Dec	SKY express
08 Dec - 13 Dec	Wizz Air UK
10 Dec - 13 Dec	easyJet
23 Dec - 01 Jan	easyJet
24 Dec - 02 Jan	Wizz Air
20 Dec - 04 Jan	easyJet
26 Dec - 01 Jan	Wizz Air UK
20 Dec - 03 Jan	easyJet
24 Dec - 03 Jan	Wizz Air
23 Dec - 03 Jan	Jet2
24 Dec - 01 Jan	SKY express
26 Dec - 03 Jan	Wizz Air UK
27 Dec - 04 Jan	Scandinavian 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 172€

Return flights