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

Return flights

01 Dec - 08 Dec	KLM
04 Dec - 11 Dec	KLM
18 Dec - 22 Dec	Ryanair
11 Dec - 14 Dec	Ryanair
04 Dec - 07 Dec	KLM
03 Dec - 08 Dec	KLM
22 Dec - 28 Dec	Ryanair
09 Dec - 19 Dec	Ryanair
13 Dec - 20 Dec	Ryanair
15 Dec - 20 Dec	Ryanair
16 Dec - 03 Jan	KLM
27 Dec - 04 Jan	LOT
26 Dec - 08 Jan	LOT
27 Dec - 05 Jan	LOT
30 Dec - 10 Jan	Ryanair
29 Dec - 06 Jan	LOT
28 Dec - 02 Jan	Ryanair
30 Dec - 02 Jan	Ryanair
26 Dec - 02 Jan	LOT
29 Dec - 02 Jan	LOT

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 210€

Return flights