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

Return flights

26 Dec - 29 Dec	KLM
28 Dec - 31 Dec	Ryanair
30 Dec - 01 Jan	Ryanair
31 Dec - 02 Jan	Ryanair
30 Dec - 02 Jan	Ryanair
22 Dec - 23 Dec	TAP
24 Dec - 29 Dec	Wizz Air
31 Dec - 09 Jan	KLM
28 Dec - 30 Dec	Ryanair
26 Dec - 02 Jan	Scandinavian Airlines
28 Dec - 01 Jan	Ryanair
22 Dec - 31 Dec	Scandinavian Airlines
28 Dec - 02 Jan	Ryanair
25 Dec - 01 Jan	KLM
30 Dec - 05 Jan	KLM
31 Dec - 03 Jan	Wizz Air
23 Dec - 26 Dec	Scandinavian Airlines
25 Dec - 28 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 212€

Return flights