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

Return flights

25 Sep - 28 Sep	Wizz Air
28 Sep - 30 Sep	Wizz Air
24 Sep - 01 Oct	Wizz Air
18 Sep - 30 Sep	Wizz Air
20 Sep - 23 Sep	Wizz Air
29 Sep - 07 Oct	Fly Play
19 Sep - 23 Sep	Scandinavian Airlines
20 Sep - 23 Sep	Icelandair	direct
19 Sep - 23 Sep	Icelandair	direct
25 Sep - 28 Sep	Icelandair	direct
29 Sep - 07 Oct	Icelandair	direct
18 Sep - 30 Sep	Icelandair	direct
28 Sep - 30 Sep	Icelandair	direct
24 Sep - 01 Oct	Icelandair	direct

Also check the deals for one-way flights from Keflavik to Stockholm 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 Keflavik to Stockholm in September from 143€

Return flights