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

Return flights

11 Dec - 14 Dec	Vueling Airlines
08 Dec - 15 Dec	KLM
13 Dec - 08 Jan	Ryanair
28 Dec - 11 Jan	Air Serbia
13 Dec - 06 Jan	Ryanair
18 Dec - 25 Dec	KLM
14 Dec - 05 Jan	Scandinavian Airlines
17 Dec - 07 Jan	Ryanair
18 Dec - 04 Jan	KLM
17 Dec - 04 Jan	Ryanair
19 Dec - 05 Jan	Scandinavian Airlines
21 Dec - 30 Dec	Air Serbia
23 Dec - 29 Dec	KLM
19 Dec - 04 Jan	Scandinavian Airlines
20 Dec - 04 Jan	Ryanair
21 Dec - 27 Dec	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 153€

Return flights