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

Return flights

07 Sep - 15 Sep	Ryanair
25 Sep - 29 Sep	Eurowings
02 Sep - 08 Sep	Eurowings
16 Sep - 25 Sep	Scandinavian Airlines
02 Sep - 10 Sep	Eurowings
09 Sep - 14 Sep	Ryanair
25 Sep - 28 Sep	Eurowings
12 Sep - 15 Sep	Scandinavian Airlines
11 Sep - 22 Sep	easyJet
21 Sep - 12 Oct	easyJet
26 Sep - 05 Oct	easyJet
30 Sep - 05 Oct	Eurowings
05 Sep - 14 Sep	easyJet
28 Sep - 06 Oct	easyJet
26 Sep - 01 Oct	easyJet
28 Sep - 04 Oct	Ryanair
19 Sep - 01 Oct	Lufthansa
27 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 205€

Return flights