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

Return flights

04 Dec - 12 Dec	Norwegian	direct
04 Dec - 11 Dec	Norwegian	direct
01 Dec - 12 Dec	Norwegian	direct
01 Dec - 11 Dec	Norwegian	direct
01 Dec - 04 Dec	Norwegian	direct
08 Dec - 12 Dec	Norwegian	direct
08 Dec - 11 Dec	Norwegian	direct
04 Dec - 22 Dec	Norwegian	direct
08 Dec - 26 Dec	Norwegian	direct
28 Dec - 11 Jan	Norwegian	direct
04 Dec - 19 Dec	Norwegian	direct
30 Dec - 11 Jan	Norwegian Air Sweden AOC
26 Dec - 11 Jan	Norwegian	direct

Also check the deals for one-way flights from Helsinki to Oslo 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 Helsinki to Oslo in December from $102

Return flights