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

Return flights

23 Sep - 27 Sep	Ryanair
25 Sep - 02 Oct	Fly Play
25 Sep - 27 Sep	Fly Play
25 Sep - 28 Sep	Fly Play
17 Sep - 05 Oct	easyJet
18 Sep - 27 Sep	Vueling Airlines
25 Sep - 30 Sep	Fly Play
24 Sep - 28 Sep	Ryanair
25 Sep - 29 Sep	KLM
29 Sep - 06 Oct	Ryanair
20 Sep - 23 Sep	Jet2
20 Sep - 27 Sep	Ryanair
20 Sep - 30 Sep	Jet2
20 Sep - 03 Oct	Jet2
20 Sep - 03 Oct	Icelandair	direct

Also check the deals for one-way flights from Alicante 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 Alicante to Keflavik in September from 247€

Return flights