AirHint found the following cheapest return flights from Helsinki (HEL) to Oulu (OUL) in September 2025 (see full year).

Return flights

11 Sep - 15 Sep	Finnair	direct
25 Sep - 26 Sep	Finnair	direct
18 Sep - 25 Sep	Finnair	direct
26 Sep - 28 Sep	Finnair	direct
01 Sep - 15 Sep	Finnair	direct
01 Sep - 08 Sep	Finnair	direct
13 Sep - 15 Sep	Finnair	direct
12 Sep - 19 Sep	Finnair	direct
02 Sep - 10 Sep	Finnair	direct
13 Sep - 13 Sep	Finnair	direct

Also check the deals for one-way flights from Helsinki to Oulu in September.

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 Oulu

Cheap car rent in Oulu

Cheapest return flights from Helsinki to Oulu in September from $132

Return flights