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

Return flights

04 Dec - 11 Dec	KLM
01 Dec - 07 Dec	Ryanair
08 Dec - 15 Dec	Ryanair
18 Dec - 21 Dec	KLM
20 Dec - 27 Dec	Ryanair
27 Dec - 04 Jan	LOT
30 Dec - 04 Jan	Ryanair
28 Dec - 04 Jan	Lufthansa
29 Dec - 05 Jan	Ryanair

Also check the deals for one-way flights from Zagreb 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 Zagreb to Keflavik in December from $238

Return flights