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

Return flights

24 Sep - 01 Oct	Ryanair
17 Sep - 14 Oct	Ryanair
18 Sep - 15 Oct	KLM
18 Sep - 30 Sep	KLM
18 Sep - 11 Oct	KLM
25 Sep - 01 Oct	KLM
23 Sep - 01 Oct	Ryanair
25 Sep - 30 Sep	KLM
25 Sep - 02 Oct	KLM
25 Sep - 29 Sep	KLM
17 Sep - 23 Sep	Ryanair
16 Sep - 24 Sep	KLM
17 Sep - 20 Sep	KLM
11 Sep - 22 Sep	KLM
18 Sep - 26 Sep	KLM
18 Sep - 25 Sep	KLM
13 Sep - 23 Sep	Iberia
27 Sep - 01 Oct	Ryanair
18 Sep - 15 Oct	Fly Play	direct
18 Sep - 11 Oct	Fly Play	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 $221

Return flights