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

Return flights

17 Oct - 22 Oct	Norwegian	direct
22 Oct - 24 Oct	Norwegian	direct
17 Oct - 24 Oct	Norwegian	direct
15 Oct - 22 Oct	Ryanair
17 Oct - 20 Oct	Norwegian
03 Oct - 06 Oct	easyJet
10 Oct - 13 Oct	easyJet
17 Oct - 18 Oct	Norwegian
17 Oct - 20 Oct	Norwegian	direct
16 Oct - 23 Oct	Ryanair

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 120€

Return flights