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

Return flights

18 Dec - 23 Dec	Norwegian	direct
18 Dec - 29 Dec	Norwegian	direct
18 Dec - 30 Dec	Norwegian	direct
06 Dec - 11 Dec	Norwegian	direct
06 Dec - 10 Dec	Norwegian	direct
06 Dec - 12 Dec	Norwegian	direct
06 Dec - 14 Dec	Norwegian	direct
06 Dec - 15 Dec	Norwegian	direct
06 Dec - 23 Dec	Norwegian	direct
23 Dec - 29 Dec	Norwegian	direct

Also check the deals for one-way flights from Kristiansand 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 Kristiansand to Oslo in December from 95€

Return flights