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

Return flights

11 Dec - 14 Dec	Ryanair
02 Dec - 07 Dec	Ryanair
05 Dec - 07 Dec	Ryanair
19 Dec - 21 Dec	Ryanair
22 Dec - 28 Dec	Air Serbia
08 Dec - 12 Dec	Air Serbia
20 Dec - 26 Dec	Ryanair
31 Dec - 06 Jan	Ryanair
22 Dec - 27 Dec	Austrian Airlines
26 Dec - 06 Jan	KLM
31 Dec - 04 Jan	Ryanair
28 Dec - 02 Jan	Ryanair
30 Dec - 02 Jan	Ryanair
26 Dec - 30 Dec	KLM
27 Dec - 02 Jan	Ryanair
25 Dec - 30 Dec	Air Serbia
28 Dec - 04 Jan	Ryanair
27 Dec - 01 Jan	Ryanair
23 Dec - 04 Jan	Ryanair
26 Dec - 02 Jan	Ryanair

Also check the deals for one-way flights from Zagreb to Porto 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 Porto in December from $159

Return flights