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 - 13 Apr	Norwegian	direct
04 Mar - 11 Mar	Ryanair
12 Mar - 21 Mar	Ryanair
06 Mar - 14 Mar	Ryanair
07 Mar - 14 Mar	TAP
07 Mar - 15 Mar	TAP
14 Mar - 21 Mar	KLM
11 Mar - 17 Mar	KLM
01 Mar - 04 Mar	TAP
30 Mar - 06 Apr	Norwegian	direct
25 Mar - 13 Apr	Vueling Airlines
30 Mar - 20 Apr	Norwegian	direct
30 Mar - 17 Apr	Norwegian	direct
30 Mar - 03 Apr	Norwegian	direct
14 Mar - 22 Mar	easyJet
30 Mar - 01 Apr	Norwegian
11 Mar - 15 Mar	Vueling Airlines
30 Mar - 01 Apr	Norwegian	direct
25 Mar - 06 Apr	Vueling Airlines

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 $173

Return flights