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

Return flights

28 Dec - 30 Dec	Ryanair
31 Dec - 05 Jan	Ryanair
31 Dec - 08 Jan	Ryanair
29 Dec - 03 Jan	Ryanair
31 Dec - 07 Jan	Ryanair
26 Dec - 30 Dec	Air Serbia
28 Dec - 03 Jan	Ryanair
29 Dec - 05 Jan	Ryanair
27 Dec - 01 Jan	Ryanair
30 Dec - 01 Jan	Ryanair
23 Dec - 27 Dec	Croatia Airlines
23 Dec - 10 Jan	Ryanair
23 Dec - 18 Jan	Ryanair
24 Dec - 27 Dec	Croatia Airlines
21 Dec - 25 Dec	Croatia Airlines
23 Dec - 30 Dec	Croatia Airlines
22 Dec - 23 Dec	Croatia Airlines
20 Dec - 25 Dec	Croatia Airlines
27 Dec - 30 Dec	Ryanair
25 Dec - 27 Dec	Air Serbia

Also check the deals for one-way flights from Zagreb to Istanbul 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 Istanbul in December from $217

Return flights