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
01 Dec - 06 Dec	SKY express
06 Dec - 10 Dec	easyJet
13 Dec - 18 Dec	easyJet
06 Dec - 13 Dec	easyJet
05 Dec - 08 Dec	Ryanair
08 Dec - 13 Dec	easyJet
01 Dec - 07 Dec	easyJet
09 Dec - 18 Dec	easyJet
15 Dec - 22 Dec	Aegean Airlines
31 Dec - 07 Jan	Wizz Air UK
31 Dec - 06 Jan	Wizz Air UK
25 Dec - 01 Jan	SKY express
24 Dec - 04 Jan	Aegean Airlines
30 Dec - 03 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 175€

Return flights