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

Return flights

07 Dec - 10 Dec	easyJet
09 Dec - 13 Dec	easyJet
02 Dec - 10 Dec	easyJet
07 Dec - 08 Dec	easyJet
06 Dec - 13 Dec	easyJet
07 Dec - 15 Dec	easyJet
05 Dec - 13 Dec	easyJet
06 Dec - 08 Dec	easyJet
01 Dec - 10 Dec	Wizz Air UK
10 Dec - 13 Dec	easyJet
19 Dec - 11 Jan	Ryanair
24 Dec - 07 Jan	Wizz Air
22 Dec - 08 Jan	Ryanair
31 Dec - 08 Jan	Wizz Air Malta
01 Dec - 01 Jan	Wizz Air UK
24 Dec - 01 Jan	Wizz Air
20 Dec - 05 Jan	Ryanair
22 Dec - 01 Jan	Ryanair
31 Dec - 10 Jan	Aegean Airlines
21 Dec - 05 Jan	Ryanair

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 163€

Return flights