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

Return flights

03 Dec - 10 Dec	Ryanair
04 Dec - 11 Dec	Ryanair
11 Dec - 19 Dec	Ryanair
10 Dec - 16 Dec	Ryanair
04 Dec - 08 Dec	Ryanair
03 Dec - 07 Dec	Ryanair
05 Dec - 07 Dec	TAP
05 Dec - 12 Dec	Scandinavian Airlines
28 Dec - 18 Jan	Wizz Air
16 Dec - 18 Dec	Ryanair
20 Dec - 07 Jan	Ryanair
11 Dec - 13 Dec	Vueling Airlines
20 Dec - 05 Jan	Ryanair
25 Dec - 14 Jan	Vueling Airlines
18 Dec - 05 Jan	Norwegian
13 Dec - 02 Jan	Ryanair
17 Dec - 04 Jan	Wizz Air
28 Dec - 14 Jan	Vueling Airlines
28 Dec - 04 Jan	Wizz Air
22 Dec - 05 Jan	Wizz Air

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 $144

Return flights