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

Return flights

29 Sep - 03 Oct	KLM
20 Sep - 24 Sep	KLM
20 Sep - 25 Sep	KLM
16 Sep - 19 Sep	SWISS
20 Sep - 23 Sep	SWISS
17 Sep - 09 Oct	KLM
19 Sep - 26 Sep	SWISS
17 Sep - 24 Sep	SWISS
18 Sep - 25 Sep	KLM
17 Sep - 30 Sep	SWISS
09 Sep - 16 Sep	SWISS
22 Sep - 29 Sep	SWISS
27 Sep - 01 Oct	KLM
27 Sep - 02 Oct	KLM
29 Sep - 06 Oct	SWISS
09 Sep - 07 Oct	KLM
25 Sep - 01 Oct	Lufthansa
26 Sep - 03 Oct	KLM
17 Sep - 08 Oct	KLM
01 Sep - 01 Oct	Lufthansa

Also check the deals for one-way flights from London 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 London to Belgrade in September from 223€

Return flights