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

Return flights

22 Sep - 03 Oct	Wizz Air Malta
30 Sep - 03 Oct	easyJet
25 Sep - 03 Oct	Wizz Air Malta
27 Sep - 06 Oct	Wizz Air Malta
17 Sep - 24 Sep	Ryanair
25 Sep - 01 Oct	Wizz Air Malta
20 Sep - 03 Oct	Wizz Air Malta
27 Sep - 05 Oct	Wizz Air Malta
27 Sep - 02 Oct	Wizz Air Malta
10 Sep - 17 Sep	Ryanair
13 Sep - 23 Sep	Ryanair
22 Sep - 01 Oct	Wizz Air Malta
18 Sep - 21 Sep	Vueling Airlines
25 Sep - 06 Oct	Wizz Air Malta
23 Sep - 28 Sep	easyJet
04 Sep - 14 Sep	Ryanair
16 Sep - 21 Sep	easyJet
16 Sep - 23 Sep	Ryanair
13 Sep - 20 Sep	Ryanair
17 Sep - 22 Sep	Vueling Airlines

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 $208

Return flights