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

Return flights

30 Mar - 08 Apr	Norwegian
06 Mar - 10 Mar	Ryanair
30 Mar - 06 Apr	Norwegian
20 Mar - 23 Mar	Ryanair
11 Mar - 15 Mar	Wizz Air
03 Mar - 31 Mar	Ryanair
10 Mar - 17 Mar	Ryanair
25 Mar - 08 Apr	Norwegian
30 Mar - 15 Apr	Norwegian	direct
02 Mar - 07 Mar	Ryanair
12 Mar - 16 Mar	Ryanair
26 Mar - 31 Mar	Ryanair
25 Mar - 03 Apr	Norwegian
25 Mar - 30 Mar	Norwegian
13 Mar - 18 Mar	Ryanair
25 Mar - 13 Apr	Norwegian	direct
30 Mar - 13 Apr	Norwegian	direct
30 Mar - 03 Apr	Norwegian
25 Mar - 06 Apr	Norwegian	direct
30 Mar - 06 Apr	Norwegian	direct

Also check the deals for one-way flights from Porto to Oslo 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 Porto to Oslo in March from $136

Return flights