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

Return flights

02 Dec - 09 Dec	Finnair	direct
11 Dec - 18 Dec	Finnair	direct
12 Dec - 14 Dec	Finnair	direct
05 Dec - 07 Dec	Finnair	direct
24 Dec - 26 Dec	Finnair	direct
05 Dec - 06 Dec	Finnair	direct
25 Dec - 28 Dec	Finnair	direct
15 Dec - 22 Dec	Finnair	direct
26 Dec - 06 Jan	Finnair	direct
15 Dec - 23 Dec	Finnair	direct

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

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 December from $132

Return flights