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

Return flights

10 May - 15 May	Norwegian	direct
10 May - 21 May	Norwegian	direct
10 May - 26 May	Norwegian	direct
15 May - 21 May	Norwegian	direct
15 May - 26 May	Norwegian	direct
22 May - 26 May	Norwegian	direct
03 May - 10 May	Norwegian	direct
03 May - 15 May	Norwegian	direct
03 May - 21 May	Norwegian	direct
22 May - 05 Jun	Norwegian	direct
03 May - 04 May	Norwegian	direct
15 May - 05 Jun	Norwegian
22 May - 12 Jun	Norwegian

Also check the deals for one-way flights from Oslo to Helsinki in May.

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 May from $118

Return flights