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

Return flights

20 Sep - 22 Sep	Ryanair
24 Sep - 25 Sep	Ryanair
26 Sep - 27 Sep	Ryanair
29 Sep - 04 Oct	Ryanair
10 Sep - 13 Sep	Ryanair
12 Sep - 28 Sep	Ryanair
25 Sep - 29 Sep	Ryanair
26 Sep - 02 Oct	Ryanair
27 Sep - 06 Oct	Lufthansa
28 Sep - 06 Oct	Lufthansa
16 Sep - 19 Sep	Ryanair
18 Sep - 21 Sep	Ryanair
01 Sep - 30 Sep	Ryanair
19 Sep - 21 Sep	Ryanair
28 Sep - 05 Oct	Lufthansa
28 Sep - 01 Oct	AJet
17 Sep - 08 Oct	AJet

Also check the deals for one-way flights from Cologne to Belgrade 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 Belgrade in September from 134€

Return flights