AirHint found the following cheapest return flights from Oslo (OSL) to Helsinki (HEL) in October 2025 (see full year).

Return flights

21 Oct - 30 Oct	Norwegian	direct
06 Oct - 14 Oct	Norwegian	direct
06 Oct - 15 Oct	Norwegian	direct
15 Oct - 30 Oct	Norwegian	direct
23 Oct - 30 Oct	Norwegian	direct
30 Oct - 07 Nov	Norwegian	direct
21 Oct - 07 Nov	Norwegian	direct
23 Oct - 07 Nov	Norwegian	direct
01 Oct - 14 Oct	Norwegian	direct
01 Oct - 15 Oct	Norwegian	direct
01 Oct - 02 Oct	Norwegian	direct
12 Oct - 14 Oct	Norwegian	direct
12 Oct - 30 Oct	Norwegian	direct
30 Oct - 20 Nov	Norwegian

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

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.

Book a cheap hotel in Helsinki

Cheap car rent in Helsinki

Cheapest return flights from Oslo to Helsinki in October from $115

Return flights