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
13 Dec - 20 Dec	Lufthansa
16 Dec - 17 Dec	Vueling Airlines
11 Dec - 16 Dec	Vueling Airlines
05 Dec - 10 Dec	ITA Airways
12 Dec - 19 Dec	Vueling Airlines
05 Dec - 12 Dec	Lufthansa
26 Dec - 04 Jan	ITA Airways
27 Dec - 30 Dec	ITA Airways
30 Dec - 04 Jan	Scandinavian Airlines
28 Dec - 02 Jan	Vueling Airlines
27 Dec - 02 Jan	Vueling Airlines
27 Dec - 03 Jan	Vueling Airlines
30 Dec - 05 Jan	Vueling Airlines

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 256€

Return flights