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

Return flights

03 Sep - 07 Oct	Pegasus Airlines
30 Sep - 01 Oct	AJet
20 Sep - 27 Sep	SunExpress
13 Sep - 01 Oct	Pegasus Airlines
23 Sep - 29 Sep	SunExpress
23 Sep - 06 Oct	SunExpress
23 Sep - 05 Oct	SunExpress
23 Sep - 30 Sep	SunExpress
05 Sep - 12 Sep	AJet
10 Sep - 16 Sep	Corendon Airlines	direct
10 Sep - 20 Sep	Corendon Airlines	direct
30 Sep - 01 Oct	Pegasus Airlines	direct
23 Sep - 24 Sep	SunExpress
20 Sep - 29 Sep	SunExpress
23 Sep - 01 Oct	SunExpress
23 Sep - 08 Oct	SunExpress
20 Sep - 06 Oct	SunExpress
20 Sep - 05 Oct	SunExpress
10 Sep - 29 Sep	Corendon Airlines	direct
20 Sep - 30 Sep	SunExpress

Also check the deals for one-way flights from Kayseri to Duesseldorf 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 Kayseri to Duesseldorf in September from $257

Return flights