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

Return flights

02 May - 08 May	Vueling Airlines
25 May - 12 Jun	Norwegian	direct
25 May - 10 Jun	Norwegian	direct
25 May - 05 Jun	Norwegian	direct
02 May - 15 May	Vueling Airlines
02 May - 22 May	Vueling Airlines
04 May - 08 May	Norwegian Air Sweden AOC
04 May - 22 May	Norwegian Air Sweden AOC
04 May - 08 May	Norwegian	direct
04 May - 15 May	Norwegian	direct
04 May - 22 May	Norwegian	direct

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

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 May from 179€

Return flights