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

Return flights

27 Aug - 03 Sep	Ryanair
28 Aug - 03 Sep	Ryanair
28 Aug - 04 Sep	Ryanair
25 Aug - 30 Aug	Ryanair
06 Aug - 14 Aug	Ryanair
07 Aug - 14 Aug	Ryanair
05 Aug - 12 Aug	Ryanair
07 Aug - 13 Aug	Ryanair
03 Aug - 10 Aug	Ryanair
08 Aug - 14 Aug	Ryanair
02 Aug - 15 Aug	Austrian Airlines
09 Aug - 19 Aug	Austrian Airlines
14 Aug - 21 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 199€

Return flights