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

Return flights

12 Dec - 19 Dec	TAP
17 Dec - 07 Jan	KLM
14 Dec - 06 Jan	KLM
16 Dec - 06 Jan	KLM
07 Dec - 20 Dec	Vueling Airlines
17 Dec - 06 Jan	KLM
17 Dec - 26 Dec	Ryanair
07 Dec - 27 Dec	Vueling Airlines
18 Dec - 26 Dec	Ryanair
17 Dec - 02 Jan	KLM
14 Dec - 20 Dec	Vueling Airlines
06 Dec - 02 Jan	Lufthansa
26 Dec - 02 Jan	KLM
20 Dec - 11 Jan	KLM
14 Dec - 27 Dec	Vueling Airlines
18 Dec - 07 Jan	Vueling Airlines
23 Dec - 29 Dec	KLM
14 Dec - 31 Dec	Vueling Airlines
18 Dec - 20 Dec	Vueling Airlines
21 Dec - 07 Jan	Vueling Airlines

Also check the deals for one-way flights from Oslo 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 Oslo to Porto in December from $182

Return flights