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

Return flights

30 Sep - 07 Oct	Wizz Air
25 Sep - 30 Sep	Wizz Air
25 Sep - 28 Sep	Wizz Air
14 Sep - 20 Sep	Wizz Air
24 Sep - 28 Sep	Wizz Air
17 Sep - 21 Sep	Wizz Air
14 Sep - 17 Sep	Wizz Air
14 Sep - 23 Sep	Wizz Air
24 Sep - 02 Oct	Ryanair
03 Sep - 06 Sep	Wizz Air
20 Sep - 25 Sep	Wizz Air
12 Sep - 16 Sep	Ryanair
26 Sep - 10 Oct	Ryanair
24 Sep - 02 Oct	Icelandair	direct
26 Sep - 10 Oct	Icelandair	direct

Also check the deals for one-way flights from Stockholm 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 Stockholm to Keflavik in September from 139€

Return flights