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

Return flights

28 Aug - 18 Sep	Ryanair	direct
28 Aug - 09 Sep	Ryanair
28 Aug - 09 Sep	Ryanair	direct
28 Aug - 10 Sep	Ryanair
28 Aug - 03 Sep	Ryanair
28 Aug - 02 Sep	Ryanair
28 Aug - 17 Sep	Ryanair
28 Aug - 11 Sep	Ryanair	direct
28 Aug - 07 Sep	Ryanair
28 Aug - 14 Sep	Ryanair
19 Aug - 27 Aug	Ryanair
23 Aug - 27 Aug	Ryanair
19 Aug - 26 Aug	Ryanair
28 Aug - 31 Aug	Ryanair
26 Aug - 29 Aug	Vueling Airlines
19 Aug - 25 Aug	Ryanair
26 Aug - 27 Aug	Ryanair
28 Aug - 29 Aug	Ryanair
26 Aug - 28 Aug	Vueling Airlines
23 Aug - 28 Aug	Ryanair

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 $190

Return flights