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

Return flights

01 Dec - 05 Dec	Ryanair
01 Dec - 09 Dec	LOT
04 Dec - 11 Dec	Ryanair
20 Dec - 27 Dec	Ryanair
12 Dec - 16 Dec	Ryanair
24 Dec - 01 Jan	Ryanair
23 Dec - 30 Dec	Ryanair
31 Dec - 04 Jan	Ryanair
24 Dec - 30 Dec	Ryanair
17 Dec - 27 Dec	Ryanair
02 Dec - 09 Dec	Ryanair
22 Dec - 28 Dec	Ryanair
25 Dec - 02 Jan	Austrian Airlines
27 Dec - 01 Jan	Lufthansa
30 Dec - 02 Jan	Ryanair
27 Dec - 03 Jan	Lufthansa

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 $295

Return flights