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

Return flights

27 Sep - 13 Oct	Air Serbia	direct
27 Sep - 30 Sep	Lufthansa
27 Sep - 01 Oct	Lufthansa
21 Sep - 03 Oct	Vueling Airlines
11 Sep - 18 Sep	Vueling Airlines
23 Sep - 30 Sep	SWISS
27 Sep - 02 Oct	Lufthansa
17 Sep - 08 Oct	Air France
21 Sep - 24 Sep	Lufthansa
11 Sep - 16 Sep	Vueling Airlines
27 Sep - 29 Sep	Lufthansa
24 Sep - 01 Oct	SWISS
27 Sep - 04 Oct	Air Serbia
11 Sep - 15 Sep	Vueling Airlines
27 Sep - 28 Sep	Lufthansa
27 Sep - 03 Oct	Lufthansa
30 Sep - 05 Oct	Lufthansa
20 Sep - 24 Sep	Air Serbia
17 Sep - 09 Oct	Air France
26 Sep - 30 Sep	Austrian Airlines

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 178€

Return flights