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

Return flights

22 Oct - 02 Nov	Norwegian
15 Oct - 22 Oct	Ryanair
22 Oct - 24 Oct	Norwegian	direct
17 Oct - 02 Nov	Norwegian
17 Oct - 24 Oct	Norwegian	direct
17 Oct - 22 Oct	Norwegian	direct
15 Oct - 20 Oct	Ryanair
29 Oct - 02 Nov	Ryanair
10 Oct - 13 Oct	easyJet
01 Oct - 10 Oct	Transavia France
17 Oct - 20 Oct	Norwegian	direct
06 Oct - 12 Oct	Ryanair
15 Oct - 02 Nov	Norwegian
15 Oct - 17 Oct	Ryanair
20 Oct - 02 Nov	Vueling Airlines
16 Oct - 02 Nov	Norwegian Air Sweden AOC
13 Oct - 02 Nov	Norwegian

Also check the deals for one-way flights from Porto to Oslo in October.

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 October from 130€

Return flights