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

Return flights

06 Dec - 07 Dec	Wizz Air
07 Dec - 14 Dec	Wizz Air
09 Dec - 12 Dec	Wizz Air
02 Dec - 04 Dec	easyJet
06 Dec - 09 Dec	Wizz Air
05 Dec - 07 Dec	KLM
05 Dec - 08 Dec	KLM
06 Dec - 07 Dec	Icelandair	direct
08 Dec - 11 Dec	Icelandair	direct
07 Dec - 10 Dec	Icelandair	direct
21 Dec - 02 Jan	Scandinavian Airlines	direct
30 Dec - 02 Jan	Icelandair	direct
29 Dec - 01 Jan	Icelandair	direct
31 Dec - 03 Jan	Icelandair	direct

Also check the deals for one-way flights from Keflavik 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 Keflavik to Oslo in December from 161€

Return flights