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

Return flights

25 Sep - 02 Oct	Ryanair
16 Sep - 21 Sep	easyJet
18 Sep - 24 Sep	KLM
16 Sep - 18 Sep	easyJet
17 Sep - 20 Sep	Ryanair
12 Sep - 14 Sep	Ryanair
18 Sep - 25 Sep	Ryanair
29 Sep - 04 Oct	Wizz Air Malta
29 Sep - 01 Oct	Wizz Air Malta
26 Sep - 05 Oct	Ryanair
25 Sep - 30 Sep	Ryanair
11 Sep - 16 Sep	Wizz Air Malta
13 Sep - 20 Sep	easyJet
24 Sep - 30 Sep	easyJet
28 Sep - 01 Oct	Ryanair
28 Sep - 02 Oct	ITA Airways

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 220€

Return flights