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

Return flights

26 Sep - 01 Oct	Ryanair	direct
17 Sep - 24 Sep	Ryanair	direct
26 Sep - 29 Sep	Ryanair	direct
19 Sep - 24 Sep	Eurowings	direct
19 Sep - 29 Sep	Eurowings	direct
17 Sep - 19 Sep	Ryanair	direct
10 Sep - 24 Sep	Eurowings	direct
24 Sep - 26 Sep	Eurowings	direct
22 Sep - 24 Sep	Ryanair	direct
10 Sep - 19 Sep	Eurowings	direct
10 Sep - 26 Sep	Eurowings	direct
29 Sep - 03 Oct	Ryanair	direct
30 Sep - 02 Oct	Ryanair
29 Sep - 02 Oct	Ryanair	direct
29 Sep - 08 Oct	Eurowings
29 Sep - 08 Oct	Eurowings	direct

Also check the deals for one-way flights from Bologna 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 return flights from Bologna to Cologne in September from $79

Return flights