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

Return flights

15 Mar - 30 Mar	Vueling Airlines
15 Mar - 01 Apr	Vueling Airlines
30 Mar - 13 Apr	Norwegian	direct
30 Mar - 08 Apr	SWISS
30 Mar - 01 Apr	Norwegian	direct
15 Mar - 03 Apr	Vueling Airlines
30 Mar - 08 Apr	Norwegian	direct
30 Mar - 17 Apr	Norwegian	direct
30 Mar - 06 Apr	Transavia France
30 Mar - 03 Apr	Norwegian	direct
30 Mar - 06 Apr	Norwegian	direct

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

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 March from 145€

Return flights