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

Return flights

01 May - 02 May	Norwegian
01 May - 09 May	Norwegian
01 May - 10 May	Norwegian
02 May - 15 May	Air Europa
22 May - 25 May	TAP
01 May - 06 May	Norwegian
15 May - 17 May	Iberia
01 May - 06 May	Norwegian	direct
06 May - 10 May	Norwegian
22 May - 10 Jun	Norwegian
01 May - 08 May	Norwegian	direct
22 May - 12 Jun	Norwegian	direct
22 May - 08 Jun	Norwegian
22 May - 10 Jun	Norwegian	direct
22 May - 08 Jun	Norwegian	direct
18 May - 08 Jun	Norwegian	direct

Also check the deals for one-way flights from Porto to Oslo 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 Porto to Oslo in May from $204

Return flights