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

Return flights

03 Dec - 08 Dec	Ryanair
06 Dec - 08 Dec	Ryanair
03 Dec - 07 Dec	Vueling Airlines
05 Dec - 08 Dec	Ryanair
04 Dec - 08 Dec	Ryanair
05 Dec - 07 Dec	Ryanair
04 Dec - 07 Dec	Ryanair
05 Dec - 09 Dec	Ryanair
19 Dec - 29 Dec	Vueling Airlines
22 Dec - 28 Dec	Ryanair
23 Dec - 26 Jan	Vueling Airlines
31 Dec - 03 Jan	Ryanair

Also check the deals for one-way flights from Porto to Oslo 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 Porto to Oslo in December from $177

Return flights