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

Return flights

23 Sep - 30 Sep	Wizz Air
04 Sep - 06 Sep	Fly Play	direct
04 Sep - 09 Sep	Fly Play	direct
25 Sep - 01 Oct	Fly Play	direct
18 Sep - 21 Sep	Wizz Air
20 Sep - 25 Sep	Wizz Air
25 Sep - 30 Sep	Wizz Air
30 Sep - 08 Oct	Wizz Air
30 Sep - 07 Oct	Wizz Air
04 Sep - 15 Sep	Fly Play	direct
02 Sep - 07 Sep	Fly Play	direct
17 Sep - 22 Sep	Fly Play	direct
18 Sep - 25 Sep	Wizz Air
30 Sep - 06 Oct	Wizz Air
22 Sep - 03 Oct	KLM
26 Sep - 05 Oct	Fly Play
29 Sep - 02 Oct	Icelandair	direct
30 Sep - 03 Oct	Icelandair	direct
22 Sep - 03 Oct	Icelandair	direct
28 Sep - 01 Oct	Icelandair	direct

Also check the deals for one-way flights from Copenhagen 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 Copenhagen to Keflavik in September from 156€

Return flights