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

Return flights

22 Aug - 27 Aug	Norwegian
29 Aug - 01 Sep	Norwegian
22 Aug - 31 Aug	Norwegian
22 Aug - 25 Aug	Norwegian
22 Aug - 24 Aug	Norwegian
22 Aug - 26 Aug	Norwegian
29 Aug - 05 Sep	Norwegian
20 Aug - 24 Aug	Norwegian
20 Aug - 25 Aug	Norwegian
29 Aug - 07 Sep	Norwegian
20 Aug - 22 Aug	Norwegian	direct
18 Aug - 27 Aug	Norwegian
06 Aug - 13 Aug	Ryanair
27 Aug - 06 Sep	Norwegian
22 Aug - 06 Sep	Norwegian
29 Aug - 06 Sep	Norwegian
29 Aug - 17 Sep	Norwegian
30 Aug - 02 Sep	KLM
27 Aug - 01 Sep	Norwegian
27 Aug - 05 Sep	Norwegian	direct

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

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 August from 177€

Return flights