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

Return flights

04 Dec - 11 Dec	Wizz Air
04 Dec - 15 Dec	KLM
29 Dec - 05 Jan	KLM
18 Dec - 23 Dec	Lufthansa
22 Dec - 26 Dec	Eurowings
23 Dec - 30 Dec	Lufthansa
26 Dec - 31 Dec	KLM
31 Dec - 04 Jan	Eurowings
28 Dec - 04 Jan	KLM
30 Dec - 06 Jan	Lufthansa
19 Dec - 23 Dec	Eurowings
24 Dec - 02 Jan	KLM
30 Dec - 02 Jan	Lufthansa
20 Dec - 05 Jan	Wizz Air
27 Dec - 31 Dec	Wizz Air

Also check the deals for one-way flights from Stuttgart 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 Stuttgart to Keflavik in December from $237

Return flights