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

Return flights

23 Sep - 01 Oct	easyJet
23 Sep - 29 Sep	easyJet
30 Sep - 04 Oct	easyJet
25 Sep - 01 Oct	Ryanair
29 Sep - 03 Oct	Vueling Airlines
20 Sep - 04 Oct	easyJet
21 Sep - 28 Sep	easyJet
10 Sep - 21 Sep	easyJet
09 Sep - 20 Sep	Ryanair
23 Sep - 30 Sep	easyJet
22 Sep - 29 Sep	Transavia France
11 Sep - 21 Sep	Ryanair
25 Sep - 30 Sep	Ryanair
26 Sep - 05 Oct	Ryanair
11 Sep - 16 Sep	Ryanair
22 Sep - 28 Sep	easyJet
28 Sep - 05 Oct	easyJet
25 Sep - 01 Oct	Fly Play	direct
20 Sep - 04 Oct	Icelandair	direct
30 Sep - 04 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 174€

Return flights