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

Return flights

03 Sep - 10 Sep	Ryanair
01 Sep - 10 Sep	Ryanair
04 Sep - 10 Sep	Eurowings	direct
03 Sep - 10 Sep	Ryanair	direct
24 Sep - 08 Oct	Ryanair	direct
24 Sep - 01 Oct	Ryanair	direct
10 Sep - 17 Sep	Ryanair	direct
03 Sep - 17 Sep	Ryanair
12 Sep - 16 Sep	Ryanair
04 Sep - 08 Sep	Eurowings	direct
10 Sep - 16 Sep	Ryanair
12 Sep - 23 Sep	Ryanair
17 Sep - 01 Oct	Ryanair	direct
27 Sep - 01 Oct	Ryanair
27 Sep - 04 Oct	Austrian Airlines
17 Sep - 15 Oct	Ryanair	direct
29 Sep - 06 Oct	Aegean Airlines
28 Sep - 04 Oct	easyJet
29 Sep - 04 Oct	easyJet
29 Sep - 01 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 121€

Return flights