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

Return flights

25 Sep - 01 Oct	Ryanair
17 Sep - 24 Sep	Ryanair
18 Sep - 23 Sep	Ryanair
10 Sep - 17 Sep	Ryanair
10 Sep - 20 Sep	Ryanair
20 Sep - 24 Sep	Ryanair
24 Sep - 28 Sep	Ryanair
27 Sep - 02 Oct	Ryanair
28 Sep - 01 Oct	Ryanair
10 Sep - 14 Sep	Ryanair
18 Sep - 28 Sep	Ryanair
11 Sep - 17 Sep	Ryanair
17 Sep - 25 Sep	Ryanair
30 Sep - 09 Oct	Ryanair
20 Sep - 03 Oct	Ryanair
28 Sep - 03 Oct	Ryanair
30 Sep - 05 Oct	Ryanair
26 Sep - 01 Oct	Ryanair
30 Sep - 07 Oct	Ryanair
26 Sep - 03 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 216€

Return flights