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

Return flights

23 Sep - 28 Sep	Vueling Airlines
24 Sep - 28 Sep	Volotea
22 Sep - 28 Sep	Scandinavian Airlines
22 Sep - 27 Sep	Scandinavian Airlines
17 Sep - 24 Sep	Vueling Airlines
22 Sep - 29 Sep	Scandinavian Airlines
21 Sep - 27 Sep	Lufthansa
17 Sep - 18 Sep	Vueling Airlines
21 Sep - 29 Sep	Lufthansa

Also check the deals for one-way flights from Florence to Keflavik in September.

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 September from 298€

Return flights