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

Return flights

16 Mar - 25 Mar	Wizz Air
10 Mar - 17 Mar	Ryanair
14 Mar - 17 Mar	Ryanair
02 Mar - 08 Mar	Wizz Air
09 Mar - 19 Mar	KLM
08 Mar - 25 Mar	Vueling Airlines
19 Mar - 30 Mar	Vueling Airlines
19 Mar - 25 Mar	Vueling Airlines
16 Mar - 23 Mar	Ryanair
13 Mar - 27 Mar	TAP
23 Mar - 07 Apr	TAP
24 Mar - 07 Apr	TAP
23 Mar - 08 Apr	KLM
22 Mar - 07 Apr	Air Serbia
25 Mar - 13 Apr	Norwegian	direct
26 Mar - 10 Apr	Ryanair
22 Mar - 10 Apr	Vueling Airlines
30 Mar - 13 Apr	Norwegian	direct
19 Mar - 08 Apr	Vueling Airlines
19 Mar - 01 Apr	Vueling Airlines

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 $119

Return flights