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

Return flights

23 Sep - 25 Sep	Ryanair
18 Sep - 25 Sep	Ryanair
23 Sep - 25 Sep	Ryanair	direct
25 Sep - 02 Oct	Ryanair
29 Sep - 02 Oct	Ryanair
08 Sep - 25 Sep	Vueling Airlines
23 Sep - 14 Oct	Ryanair	direct
19 Sep - 25 Sep	Ryanair
24 Sep - 30 Sep	Ryanair
23 Sep - 02 Oct	Ryanair	direct
20 Sep - 25 Sep	Ryanair
30 Sep - 16 Oct	Ryanair	direct
30 Sep - 14 Oct	Ryanair	direct
30 Sep - 02 Oct	Ryanair	direct
23 Sep - 09 Oct	Ryanair	direct
23 Sep - 30 Sep	Vueling Airlines
24 Sep - 29 Sep	Ryanair
25 Sep - 30 Sep	Ryanair
30 Sep - 04 Oct	Ryanair
30 Sep - 07 Oct	Ryanair

Also check the deals for one-way flights from Cagliari 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 Cagliari to Porto in September from $135

Return flights