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

Return flights

04 Dec - 08 Dec	KLM
04 Dec - 11 Dec	KLM
04 Dec - 07 Dec	KLM
31 Dec - 07 Jan	Eurowings
07 Dec - 14 Dec	Eurowings
10 Dec - 14 Dec	KLM
05 Dec - 08 Dec	Scandinavian Airlines
05 Dec - 09 Dec	Eurowings
24 Dec - 30 Dec	Eurowings
22 Dec - 06 Jan	Eurowings
14 Dec - 21 Dec	Lufthansa
30 Dec - 01 Jan	Wizz Air
18 Dec - 25 Dec	KLM
23 Dec - 07 Jan	LOT
29 Dec - 01 Jan	Scandinavian Airlines
27 Dec - 07 Jan	SunExpress
29 Dec - 03 Jan	Wizz Air Malta
30 Dec - 02 Jan	Wizz Air
28 Dec - 07 Jan	Scandinavian Airlines
29 Dec - 05 Jan	Scandinavian Airlines

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 $257

Return flights