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

Return flights

29 Sep - 06 Oct	Scandinavian Airlines
17 Sep - 23 Sep	Ryanair
25 Sep - 29 Sep	Scandinavian Airlines
04 Sep - 08 Sep	Eurowings	direct
18 Sep - 29 Sep	Scandinavian Airlines
18 Sep - 25 Sep	KLM
17 Sep - 24 Sep	KLM
04 Sep - 10 Sep	KLM
25 Sep - 13 Oct	Scandinavian Airlines
21 Sep - 02 Oct	Ryanair
28 Sep - 06 Oct	Ryanair
21 Sep - 29 Sep	Ryanair
01 Sep - 09 Sep	easyJet
01 Sep - 08 Sep	easyJet
27 Sep - 06 Oct	Scandinavian Airlines
29 Sep - 05 Oct	Scandinavian Airlines
29 Sep - 07 Oct	Scandinavian Airlines
27 Sep - 05 Oct	Eurowings
29 Sep - 10 Oct	Scandinavian Airlines
20 Sep - 04 Oct	Eurowings

Also check the deals for one-way flights from Duesseldorf 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 Duesseldorf to Keflavik in September from 182€

Return flights