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

Return flights

06 Mar - 19 Mar	Norwegian	direct
06 Mar - 08 Mar	Norwegian	direct
08 Mar - 19 Mar	Norwegian	direct
15 Mar - 19 Mar	Norwegian	direct
22 Mar - 02 Apr	Norwegian	direct
22 Mar - 01 Apr	Norwegian	direct
15 Mar - 02 Apr	Norwegian	direct
15 Mar - 01 Apr	Norwegian	direct
22 Mar - 08 Apr	Norwegian	direct
08 Mar - 08 Mar	Norwegian

Also check the deals for one-way flights from Oslo to Helsinki 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 Helsinki in March from 100€

Return flights