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

Return flights

31 Aug - 10 Sep	Ryanair
26 Aug - 05 Sep	Ryanair
26 Aug - 30 Aug	Ryanair
05 Aug - 06 Aug	Ryanair
04 Aug - 06 Aug	Ryanair
28 Aug - 04 Sep	Ryanair
25 Aug - 29 Aug	Ryanair
22 Aug - 27 Aug	Ryanair
31 Aug - 05 Sep	Ryanair
23 Aug - 29 Aug	Lufthansa
21 Aug - 28 Aug	Ryanair
12 Aug - 25 Aug	Ryanair
18 Aug - 25 Aug	Ryanair
22 Aug - 26 Aug	Lufthansa

Also check the deals for one-way flights from Zagreb to Porto in August.

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 August from $227

Return flights