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

Return flights

11 Dec - 14 Dec	KLM
12 Dec - 15 Dec	SWISS
05 Dec - 09 Dec	Lufthansa
02 Dec - 14 Dec	ITA Airways
05 Dec - 12 Dec	Vueling Airlines
31 Dec - 07 Jan	Vueling Airlines
18 Dec - 25 Dec	Vueling Airlines
16 Dec - 21 Dec	Lufthansa
20 Dec - 26 Dec	Lufthansa
20 Dec - 27 Dec	Vueling Airlines
24 Dec - 31 Dec	Lufthansa
26 Dec - 04 Jan	Air Serbia
24 Dec - 04 Jan	Lufthansa
30 Dec - 05 Jan	Vueling Airlines
25 Dec - 02 Jan	Vueling Airlines
27 Dec - 02 Jan	Vueling Airlines
27 Dec - 03 Jan	SWISS

Also check the deals for one-way flights from Florence 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 Florence to Keflavik in December from $306

Return flights