AirHint found the following cheapest return flights from Naples (NAP) to Keflavik (KEF) in September 2026 (see full year).

Return flights

19 Sep - 27 Sep	easyJet
18 Sep - 29 Sep	easyJet
26 Sep - 04 Oct	easyJet
18 Sep - 24 Sep	easyJet
07 Sep - 12 Sep	easyJet
05 Sep - 12 Sep	easyJet
01 Sep - 05 Sep	Scandinavian Airlines
21 Sep - 29 Sep	easyJet
02 Sep - 05 Sep	Scandinavian Airlines
18 Sep - 27 Sep	Transavia France
21 Sep - 25 Sep	easyJet

Also check the deals for one-way flights from Naples 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 Naples to Keflavik in September from $279

Return flights