AirHint found the following cheapest one-way flights from Istanbul (IST) to Cologne (CGN) in September 2025 (see full year).

One-Way flights

17 Sep	Pegasus Airlines	direct
16 Sep	Pegasus Airlines	direct
18 Sep	Pegasus Airlines	direct
23 Sep	AJet	direct
30 Sep	AJet	direct
04 Sep	Pegasus Airlines	direct
11 Sep	AJet	direct
12 Sep	Pegasus Airlines	direct
09 Sep	Pegasus Airlines	direct
24 Sep	AJet	direct

Also check the deals for return flights from Istanbul to Cologne 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 one-way flights from Istanbul to Cologne in September from $33

One-Way flights