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

Return flights

29 Aug - 03 Sep	Norwegian
29 Aug - 07 Sep	Norwegian
29 Aug - 05 Sep	Norwegian
29 Aug - 31 Aug	Norwegian
27 Aug - 05 Sep	Norwegian
29 Aug - 17 Sep	Norwegian
29 Aug - 03 Sep	Norwegian	direct
27 Aug - 31 Aug	Norwegian
20 Aug - 26 Aug	Norwegian
29 Aug - 15 Sep	Norwegian
22 Aug - 24 Aug	Norwegian
27 Aug - 03 Sep	Norwegian	direct
22 Aug - 31 Aug	Norwegian
29 Aug - 05 Sep	Norwegian	direct
22 Aug - 03 Sep	Norwegian	direct
22 Aug - 23 Aug	Norwegian
15 Aug - 18 Aug	Norwegian
20 Aug - 23 Aug	Norwegian
22 Aug - 25 Aug	Norwegian	direct
08 Aug - 15 Aug	Vueling Airlines

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.

Book a cheap hotel in Oslo

Cheap car rent in Oslo

Cheapest return flights from Porto to Oslo in August from 152€

Return flights