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

Return flights

10 Sep - 17 Sep	Ryanair	direct
10 Sep - 16 Sep	Ryanair	direct
11 Sep - 16 Sep	Condor	direct
11 Sep - 17 Sep	Condor	direct
07 Sep - 11 Sep	Condor	direct
17 Sep - 23 Sep	Ryanair	direct
07 Sep - 16 Sep	Condor	direct
11 Sep - 15 Sep	Condor	direct
17 Sep - 24 Sep	Ryanair	direct
14 Sep - 17 Sep	Condor	direct
25 Sep - 09 Oct	Eurowings
25 Sep - 02 Oct	Eurowings
24 Sep - 08 Oct	Ryanair
24 Sep - 08 Oct	Ryanair	direct
24 Sep - 01 Oct	Ryanair	direct
29 Sep - 12 Oct	Ryanair
25 Sep - 03 Oct	Eurowings
29 Sep - 06 Oct	Ryanair
19 Sep - 02 Oct	Eurowings
27 Sep - 01 Oct	Lufthansa

Also check the deals for one-way flights from Duesseldorf to Kos 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 Kos in September from $101

Return flights