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

Return flights

10 Dec - 14 Dec	Ryanair
01 Dec - 10 Dec	Ryanair
06 Dec - 10 Dec	Ryanair
04 Dec - 12 Dec	Ryanair
03 Dec - 07 Dec	Ryanair
11 Dec - 13 Dec	Ryanair
10 Dec - 17 Dec	Ryanair
04 Dec - 08 Dec	Ryanair
05 Dec - 09 Dec	Ryanair
06 Dec - 08 Dec	Ryanair
24 Dec - 03 Jan	Ryanair
24 Dec - 02 Jan	Ryanair
23 Dec - 01 Jan	Ryanair
23 Dec - 04 Jan	Ryanair
31 Dec - 04 Jan	Ryanair
23 Dec - 02 Jan	Ryanair
31 Dec - 05 Jan	Ryanair
26 Dec - 06 Jan	Ryanair
29 Dec - 01 Jan	Ryanair
27 Dec - 07 Jan	Ryanair

Also check the deals for one-way flights from Rome 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 Rome to Keflavik in December from $278

Return flights