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

Return flights

11 Dec - 13 Dec	Ryanair
01 Dec - 04 Dec	Ryanair
12 Dec - 14 Dec	Ryanair
11 Dec - 15 Dec	Ryanair
05 Dec - 07 Dec	Ryanair
12 Dec - 15 Dec	Ryanair
22 Dec - 26 Dec	Air Serbia
01 Dec - 03 Dec	Ryanair
20 Dec - 27 Dec	Ryanair
26 Dec - 29 Dec	Air Serbia
30 Dec - 02 Jan	Ryanair
29 Dec - 02 Jan	Ryanair
27 Dec - 07 Jan	Lufthansa
27 Dec - 06 Jan	Lufthansa
30 Dec - 04 Jan	Ryanair
29 Dec - 04 Jan	Ryanair
31 Dec - 03 Jan	Ryanair
27 Dec - 04 Jan	Lufthansa

Also check the deals for one-way flights from Zagreb to Sofia 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 Sofia in December from $157

Return flights