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

Return flights

01 Dec - 05 Dec	Wizz Air UK
08 Dec - 12 Dec	Wizz Air UK
06 Dec - 13 Dec	easyJet
08 Dec - 13 Dec	Wizz Air UK
10 Dec - 13 Dec	SKY express
05 Dec - 08 Dec	easyJet
03 Dec - 13 Dec	easyJet
05 Dec - 13 Dec	easyJet
01 Dec - 09 Dec	Wizz Air UK
03 Dec - 12 Dec	Wizz Air UK
28 Dec - 10 Jan	easyJet
29 Dec - 07 Jan	Wizz Air UK
30 Dec - 09 Jan	Wizz Air UK
28 Dec - 05 Jan	easyJet
25 Dec - 01 Jan	Air Serbia
20 Dec - 02 Jan	easyJet
27 Dec - 06 Jan	easyJet
27 Dec - 05 Jan	easyJet
28 Dec - 04 Jan	Wizz Air UK
26 Dec - 04 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 147€

Return flights