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
02 Dec - 05 Dec	Wizz Air UK
16 Dec - 18 Dec	Aegean Airlines
13 Dec - 17 Dec	Ryanair
02 Dec - 06 Dec	Wizz Air UK
15 Dec - 19 Dec	easyJet
11 Dec - 15 Dec	easyJet
30 Dec - 04 Jan	Scandinavian Airlines
31 Dec - 05 Jan	Scandinavian Airlines
08 Dec - 15 Dec	easyJet
23 Dec - 01 Jan	easyJet
02 Dec - 09 Dec	British Airways
22 Dec - 31 Dec	Aegean Airlines
23 Dec - 03 Jan	easyJet
27 Dec - 01 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 178€

Return flights