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

Return flights

27 Aug - 29 Aug	Finnair	direct
19 Aug - 21 Aug	Finnair	direct
12 Aug - 14 Aug	Finnair	direct
08 Aug - 09 Aug	Finnair	direct
01 Aug - 31 Aug	Finnair	direct
16 Aug - 17 Aug	Finnair	direct
16 Aug - 23 Aug	Finnair	direct
08 Aug - 10 Aug	Finnair	direct
07 Aug - 14 Aug	Finnair	direct
02 Aug - 06 Aug	Finnair	direct

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

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 Oulu to Helsinki in August from $136

Return flights