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

Return flights

31 Dec - 08 Jan	Ryanair
11 Dec - 18 Dec	Ryanair
08 Dec - 15 Dec	Ryanair
13 Dec - 20 Dec	Ryanair
13 Dec - 18 Dec	Ryanair
05 Dec - 12 Dec	Ryanair
31 Dec - 03 Jan	Ryanair
31 Dec - 04 Jan	Ryanair
31 Dec - 06 Jan	Ryanair
12 Dec - 17 Dec	Ryanair
26 Dec - 05 Jan	Ryanair
15 Dec - 16 Dec	Ryanair
26 Dec - 29 Dec	Ryanair
27 Dec - 02 Jan	Ryanair
29 Dec - 02 Jan	Ryanair
30 Dec - 05 Jan	Austrian Airlines
10 Dec - 13 Dec	LOT
30 Dec - 04 Jan	Austrian Airlines
25 Dec - 05 Jan	LOT
25 Dec - 29 Dec	LOT

Also check the deals for one-way flights from Zagreb to Bucharest 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 Bucharest in December from $144

Return flights