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

Return flights

17 Sep - 24 Sep	Ryanair	direct
10 Sep - 17 Sep	Ryanair	direct
10 Sep - 24 Sep	Ryanair	direct
03 Sep - 10 Sep	Ryanair	direct
07 Sep - 17 Sep	Ryanair
17 Sep - 25 Sep	Ryanair
01 Sep - 09 Sep	Ryanair
07 Sep - 16 Sep	Ryanair
01 Sep - 08 Sep	Ryanair
19 Sep - 30 Sep	Ryanair
27 Sep - 05 Oct	Ryanair
30 Sep - 10 Oct	Aegean Airlines
22 Sep - 08 Oct	SKY express
28 Sep - 05 Oct	Ryanair
25 Sep - 02 Oct	SKY express
28 Sep - 15 Oct	SKY express
26 Sep - 08 Oct	SKY express
19 Sep - 08 Oct	SKY express
18 Sep - 02 Oct	Aegean Airlines
21 Sep - 08 Oct	SKY express

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 $153

Return flights