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

Return flights

09 Dec - 16 Dec	KLM
04 Dec - 08 Dec	KLM
05 Dec - 12 Dec	KLM
08 Dec - 16 Dec	KLM
10 Dec - 16 Dec	KLM
01 Dec - 09 Dec	KLM
08 Dec - 12 Dec	KLM
08 Dec - 15 Dec	KLM
10 Dec - 15 Dec	SWISS
02 Dec - 05 Dec	KLM
31 Dec - 15 Jan	KLM
31 Dec - 09 Jan	KLM
31 Dec - 01 Jan	KLM
17 Dec - 14 Jan	KLM
30 Dec - 06 Jan	SWISS
31 Dec - 06 Jan	KLM
26 Dec - 01 Jan	KLM
24 Dec - 04 Jan	ITA Airways
18 Dec - 08 Jan	ITA Airways
16 Dec - 06 Jan	SWISS

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 204€

Return flights