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

Return flights

01 Sep - 10 Sep	Ryanair
15 Sep - 18 Sep	Ryanair
01 Sep - 11 Sep	Ryanair
22 Sep - 25 Sep	Ryanair
30 Sep - 07 Oct	Ryanair
24 Sep - 28 Sep	Ryanair
15 Sep - 28 Sep	Ryanair
22 Sep - 28 Sep	Ryanair
20 Sep - 25 Sep	Ryanair
29 Sep - 05 Oct	Ryanair
27 Sep - 05 Oct	Ryanair
22 Sep - 12 Oct	Ryanair
17 Sep - 20 Sep	Ryanair
26 Sep - 06 Oct	Ryanair
22 Sep - 27 Sep	Ryanair
27 Sep - 04 Oct	Ryanair
26 Sep - 08 Oct	Ryanair
28 Sep - 03 Oct	Ryanair
28 Sep - 05 Oct	Ryanair

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

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 September from $171

Return flights