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

One-Way flights

22 Sep	Finnair	direct
25 Sep	Finnair	direct
29 Sep	Finnair	direct
17 Sep	Finnair	direct
27 Sep	Finnair	direct
16 Sep	Finnair	direct
15 Sep	Finnair	direct
08 Sep	Finnair	direct
24 Sep	Finnair	direct
30 Sep	Finnair	direct

Also check the deals for return flights from Oulu to Helsinki 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.

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Cheapest one-way flights from Oulu to Helsinki in September from $56

One-Way flights