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

Return flights

10 Sep - 17 Sep	Ryanair
24 Sep - 01 Oct	Ryanair
23 Sep - 02 Oct	Ryanair
04 Sep - 14 Sep	Ryanair
24 Sep - 03 Oct	Ryanair
05 Sep - 08 Sep	Ryanair
06 Sep - 13 Sep	Ryanair
25 Sep - 02 Oct	Ryanair
18 Sep - 23 Sep	Ryanair
12 Sep - 14 Sep	Ryanair
02 Sep - 04 Sep	Ryanair
04 Sep - 08 Sep	Ryanair
24 Sep - 29 Sep	Ryanair
06 Sep - 09 Sep	Ryanair
26 Sep - 03 Oct	Ryanair
30 Sep - 07 Oct	Ryanair
12 Sep - 01 Oct	Ryanair
28 Sep - 05 Oct	Ryanair
20 Sep - 03 Oct	Ryanair
15 Sep - 01 Oct	Ryanair

Also check the deals for one-way flights from Rome 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 Rome to Keflavik in September from 212€

Return flights