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

Return flights

22 Oct - 28 Oct	Norwegian
24 Oct - 28 Oct	Norwegian
06 Oct - 10 Oct	easyJet
08 Oct - 15 Oct	Ryanair
15 Oct - 22 Oct	Ryanair
22 Oct - 29 Oct	Norwegian
24 Oct - 29 Oct	Norwegian
05 Oct - 09 Oct	Ryanair
15 Oct - 19 Oct	Ryanair
05 Oct - 15 Oct	Ryanair
24 Oct - 03 Nov	Norwegian
25 Oct - 01 Nov	Vueling Airlines
18 Oct - 02 Nov	Vueling Airlines
25 Oct - 15 Nov	Vueling Airlines
22 Oct - 08 Nov	Norwegian
24 Oct - 08 Nov	Norwegian
25 Oct - 08 Nov	Vueling Airlines
20 Oct - 08 Nov	Vueling Airlines
18 Oct - 08 Nov	Vueling Airlines
22 Oct - 01 Nov	Norwegian

Also check the deals for one-way flights from Oslo to Porto 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 Oslo to Porto in October from $146

Return flights