AirHint found the following cheapest return flights from Oslo (OSL) to Porto (OPO) in August 2026 (see full year).

Return flights

07 Aug - 21 Aug	Norwegian	direct
14 Aug - 21 Aug	Norwegian	direct
10 Aug - 21 Aug	Norwegian	direct
19 Aug - 21 Aug	Vueling Airlines
07 Aug - 17 Aug	Norwegian	direct
14 Aug - 17 Aug	Norwegian	direct
10 Aug - 17 Aug	Norwegian	direct
19 Aug - 21 Aug	Norwegian	direct
07 Aug - 14 Aug	TAP
10 Aug - 14 Aug	TAP
24 Aug - 14 Sep	Norwegian Air Sweden AOC

Also check the deals for one-way flights from Oslo to Porto 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 Oslo to Porto in August from 179€

Return flights