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

Return flights

11 Dec - 15 Dec	Vueling Airlines
06 Dec - 10 Dec	Lufthansa
09 Dec - 15 Dec	Lufthansa
07 Dec - 10 Dec	Lufthansa
15 Dec - 18 Dec	LOT
06 Dec - 14 Dec	Lufthansa
06 Dec - 09 Dec	Lufthansa
15 Dec - 20 Dec	LOT
09 Dec - 16 Dec	Lufthansa
07 Dec - 14 Dec	Lufthansa
31 Dec - 15 Jan	Eurowings
30 Dec - 06 Jan	SWISS
27 Dec - 10 Jan	Austrian Airlines
29 Dec - 10 Jan	Austrian Airlines
29 Dec - 06 Jan	Austrian Airlines
31 Dec - 06 Jan	SWISS
31 Dec - 09 Jan	SWISS
16 Dec - 06 Jan	SWISS
31 Dec - 15 Jan	Air Serbia	direct
17 Dec - 12 Jan	Vueling Airlines

Also check the deals for one-way flights from London to Belgrade in December.

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 December from 173€

Return flights