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

Return flights

27 Aug - 11 Sep	SWISS	direct
19 Aug - 02 Sep	easyJet	direct
19 Aug - 01 Sep	easyJet
19 Aug - 26 Aug	easyJet
18 Aug - 01 Sep	easyJet
25 Aug - 01 Sep	easyJet
19 Aug - 27 Aug	easyJet	direct
20 Aug - 03 Sep	easyJet
31 Aug - 11 Sep	SWISS	direct
20 Aug - 09 Sep	easyJet
12 Aug - 26 Aug	TAP
12 Aug - 03 Sep	TAP
26 Aug - 10 Sep	SWISS	direct
06 Aug - 26 Aug	SWISS
22 Aug - 26 Aug	TAP
19 Aug - 29 Aug	easyJet	direct
22 Aug - 27 Aug	TAP
20 Aug - 28 Aug	easyJet	direct
23 Aug - 27 Aug	TAP
25 Aug - 29 Aug	easyJet	direct

Also check the deals for one-way flights from Zurich 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 Zurich to Porto in August from $152

Return flights