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

Return flights

01 Sep - 09 Sep	Fly Play	direct
04 Sep - 09 Sep	Fly Play	direct
29 Sep - 02 Oct	Fly Play	direct
20 Sep - 24 Sep	Fly Play	direct
01 Sep - 04 Sep	Fly Play	direct
06 Sep - 09 Sep	Fly Play	direct
21 Sep - 24 Sep	Fly Play	direct
01 Sep - 24 Sep	Fly Play	direct
23 Sep - 30 Sep	Wizz Air
15 Sep - 18 Sep	Fly Play	direct
07 Sep - 10 Sep	Fly Play	direct
28 Sep - 05 Oct	Wizz Air
29 Sep - 06 Oct	Fly Play	direct
28 Sep - 01 Oct	Fly Play	direct
30 Sep - 03 Oct	Icelandair	direct
28 Sep - 05 Oct	Icelandair	direct

Also check the deals for one-way flights from Keflavik to Copenhagen 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 Copenhagen in September from 136€

Return flights