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

Return flights

06 Dec - 10 Dec	Ryanair
31 Dec - 12 Jan	Ryanair
31 Dec - 10 Jan	Ryanair
31 Dec - 09 Jan	Ryanair
12 Dec - 15 Dec	Ryanair
31 Dec - 07 Jan	Ryanair
31 Dec - 11 Jan	Ryanair
10 Dec - 15 Dec	Ryanair
31 Dec - 08 Jan	Ryanair
14 Dec - 18 Dec	Ryanair
03 Dec - 07 Dec	Ryanair
05 Dec - 08 Dec	Ryanair
01 Dec - 08 Dec	Ryanair
07 Dec - 12 Dec	Ryanair
07 Dec - 13 Dec	Ryanair
30 Dec - 12 Jan	Ryanair
05 Dec - 12 Dec	Ryanair
30 Dec - 08 Jan	Ryanair
29 Dec - 12 Jan	Ryanair
30 Dec - 10 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 $131

Return flights