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

Return flights

08 Dec - 11 Dec	KLM
08 Dec - 12 Dec	KLM
08 Dec - 15 Dec	KLM
09 Dec - 12 Dec	KLM
02 Dec - 16 Dec	KLM
05 Dec - 12 Dec	KLM
06 Dec - 12 Dec	SWISS
06 Dec - 14 Dec	SWISS
01 Dec - 04 Dec	KLM
06 Dec - 13 Dec	ITA Airways
31 Dec - 09 Jan	KLM
31 Dec - 12 Jan	KLM
31 Dec - 07 Jan	KLM
31 Dec - 08 Jan	KLM
31 Dec - 05 Jan	KLM
31 Dec - 01 Jan	KLM
29 Dec - 14 Jan	KLM
26 Dec - 01 Jan	KLM
31 Dec - 06 Jan	KLM
30 Dec - 08 Jan	KLM

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 $243

Return flights