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

Return flights

16 Sep - 05 Oct	Ryanair
17 Sep - 25 Sep	Wizz Air
17 Sep - 23 Sep	Wizz Air
16 Sep - 23 Sep	Wizz Air Malta
23 Sep - 02 Oct	Ryanair
23 Sep - 28 Sep	Wizz Air Malta
25 Sep - 05 Oct	Wizz Air Malta
15 Sep - 23 Sep	Wizz Air Malta
11 Sep - 16 Sep	Wizz Air
27 Sep - 04 Oct	Vueling Airlines
16 Sep - 24 Sep	Ryanair
24 Sep - 28 Sep	Wizz Air Malta
30 Sep - 05 Oct	Ryanair
16 Sep - 20 Sep	Ryanair
10 Sep - 16 Sep	Wizz Air
29 Sep - 20 Oct	Wizz Air Malta
29 Sep - 19 Oct	Wizz Air Malta
26 Sep - 01 Oct	Vueling Airlines
29 Sep - 05 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 219€

Return flights