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

Return flights

03 Dec - 14 Dec	Scandinavian Airlines
03 Dec - 14 Dec	Icelandair	direct
17 Dec - 21 Dec	LOT
29 Dec - 06 Jan	LOT
17 Dec - 20 Dec	Scandinavian Airlines
27 Dec - 29 Dec	Icelandair	direct
17 Dec - 20 Dec	Icelandair	direct
28 Dec - 06 Jan	Icelandair	direct
17 Dec - 21 Dec	Icelandair	direct
29 Dec - 06 Jan	Icelandair	direct

Also check the deals for one-way flights from Stockholm to Keflavik 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 Stockholm to Keflavik in December from 214€

Return flights