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

Return flights

27 Sep - 05 Oct	Wizz Air
30 Sep - 05 Oct	Wizz Air
27 Sep - 01 Oct	Wizz Air
30 Sep - 08 Oct	Wizz Air
30 Sep - 07 Oct	Wizz Air
25 Sep - 09 Oct	Wizz Air
25 Sep - 01 Oct	Wizz Air
25 Sep - 08 Oct	Wizz Air
16 Sep - 23 Sep	Wizz Air
18 Sep - 24 Sep	Wizz Air
18 Sep - 23 Sep	Wizz Air
20 Sep - 24 Sep	Wizz Air
18 Sep - 21 Sep	Wizz Air
25 Sep - 05 Oct	Wizz Air
16 Sep - 21 Sep	Wizz Air
06 Sep - 17 Sep	Fly Play	direct
06 Sep - 08 Sep	Fly Play	direct
06 Sep - 09 Sep	Fly Play	direct
20 Sep - 25 Sep	Scandinavian Airlines	direct
26 Sep - 04 Oct	Fly Play	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 $174

Return flights