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

Return flights

29 Sep - 04 Oct	Air Serbia	direct
20 Sep - 23 Sep	Air Serbia	direct
04 Sep - 09 Sep	Vueling Airlines
04 Sep - 08 Sep	Vueling Airlines
10 Sep - 24 Sep	Lufthansa
02 Sep - 20 Sep	Lufthansa
01 Sep - 30 Sep	Lufthansa
10 Sep - 30 Sep	Lufthansa
14 Sep - 18 Sep	Lufthansa
13 Sep - 18 Sep	Lufthansa
02 Sep - 09 Sep	Lufthansa
17 Sep - 08 Oct	Air Serbia	direct
27 Sep - 05 Oct	Air Serbia	direct
16 Sep - 02 Oct	Lufthansa
29 Sep - 06 Oct	Lufthansa
30 Sep - 05 Oct	Lufthansa
30 Sep - 05 Oct	Air Serbia	direct
26 Sep - 01 Oct	Lufthansa
25 Sep - 02 Oct	KLM
16 Sep - 02 Oct	Air Serbia	direct

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 146€

Return flights