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

Return flights

30 Mar - 18 Apr	Norwegian
30 Mar - 15 Apr	Norwegian
25 Mar - 30 Mar	Norwegian
30 Mar - 07 Apr	Norwegian
11 Mar - 22 Mar	Ryanair
30 Mar - 06 Apr	Norwegian
02 Mar - 05 Mar	Ryanair
12 Mar - 16 Mar	Ryanair
10 Mar - 22 Mar	Ryanair
19 Mar - 23 Mar	Ryanair
18 Mar - 22 Mar	Ryanair
14 Mar - 21 Mar	Ryanair
12 Mar - 22 Mar	Ryanair
04 Mar - 09 Mar	Ryanair
30 Mar - 15 Apr	Norwegian	direct
30 Mar - 04 Apr	Norwegian
25 Mar - 13 Apr	Norwegian	direct
30 Mar - 13 Apr	Norwegian	direct
25 Mar - 06 Apr	Norwegian
25 Mar - 08 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 100€

Return flights