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

Return flights

25 Aug - 02 Sep	Ryanair
10 Aug - 18 Aug	Ryanair
10 Aug - 19 Aug	Ryanair
18 Aug - 22 Aug	Ryanair
18 Aug - 21 Aug	Ryanair
01 Aug - 08 Aug	Ryanair
24 Aug - 27 Aug	Ryanair
02 Aug - 03 Aug	Ryanair
24 Aug - 28 Aug	KLM
07 Aug - 14 Aug	Lufthansa
25 Aug - 29 Aug	Lufthansa

Also check the deals for one-way flights from Porto to Zagreb 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 Porto to Zagreb in August from $268

Return flights