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

Return flights

21 Aug - 28 Aug	SWISS
26 Aug - 09 Sep	Ryanair
26 Aug - 10 Sep	Ryanair
26 Aug - 09 Sep	Ryanair	direct
26 Aug - 04 Sep	Ryanair	direct
02 Aug - 07 Aug	Ryanair
31 Aug - 17 Sep	Vueling Airlines
26 Aug - 12 Sep	Ryanair
26 Aug - 11 Sep	Ryanair	direct
26 Aug - 16 Sep	Ryanair	direct
27 Aug - 17 Sep	Vueling Airlines
26 Aug - 27 Aug	Ryanair
26 Aug - 31 Aug	Ryanair
31 Aug - 09 Sep	Vueling Airlines
04 Aug - 11 Aug	Vueling Airlines
11 Aug - 27 Aug	Vueling Airlines
02 Aug - 05 Aug	Ryanair
12 Aug - 26 Aug	easyJet
11 Aug - 31 Aug	Vueling Airlines
05 Aug - 07 Aug	Ryanair	direct

Also check the deals for one-way flights from Cagliari 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 Cagliari to Porto in August from $223

Return flights