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

Return flights

06 Dec - 11 Dec	Ryanair
06 Dec - 10 Dec	Ryanair
07 Dec - 11 Dec	Ryanair
13 Dec - 14 Dec	Vueling Airlines
06 Dec - 12 Dec	Ryanair
11 Dec - 18 Dec	easyJet
11 Dec - 14 Dec	easyJet
08 Dec - 11 Dec	Ryanair
11 Dec - 15 Dec	easyJet
15 Dec - 21 Dec	Ryanair
31 Dec - 05 Jan	Ryanair
31 Dec - 01 Jan	Ryanair
31 Dec - 03 Jan	Ryanair
31 Dec - 04 Jan	Ryanair
22 Dec - 06 Jan	Vueling Airlines
26 Dec - 02 Jan	Ryanair
27 Dec - 02 Jan	Ryanair
29 Dec - 02 Jan	Ryanair
29 Dec - 04 Jan	Ryanair
20 Dec - 06 Jan	Vueling Airlines

Also check the deals for one-way flights from Cagliari to Porto in December.

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 December from $137

Return flights