AirHint found the following cheapest return flights from Cologne (CGN) to Berlin (BER) in September 2025 (see full year).

Return flights

29 Sep - 29 Sep	Eurowings	direct
03 Sep - 08 Sep	Eurowings	direct
10 Sep - 11 Sep	Eurowings	direct
05 Sep - 08 Sep	Eurowings	direct
01 Sep - 08 Sep	Eurowings	direct
09 Sep - 10 Sep	Eurowings	direct
04 Sep - 08 Sep	Eurowings	direct
28 Sep - 04 Oct	Eurowings	direct
10 Sep - 17 Sep	Eurowings	direct
10 Sep - 16 Sep	Eurowings	direct
09 Sep - 12 Sep	Eurowings	direct

Also check the deals for one-way flights from Cologne to Berlin 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 Cologne to Berlin in September from $104

Return flights