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

Return flights

18 Dec - 22 Dec	KLM
10 Dec - 15 Dec	KLM
08 Dec - 15 Dec	KLM
09 Dec - 15 Dec	KLM
09 Dec - 16 Dec	KLM
31 Dec - 06 Jan	KLM
05 Dec - 07 Dec	SWISS
01 Dec - 05 Dec	KLM
12 Dec - 15 Dec	SWISS
18 Dec - 21 Dec	KLM
11 Dec - 16 Dec	KLM
29 Dec - 12 Jan	KLM
30 Dec - 02 Jan	KLM
26 Dec - 02 Jan	Lufthansa
28 Dec - 11 Jan	SWISS
14 Dec - 04 Jan	SWISS
28 Dec - 01 Jan	SWISS
19 Dec - 04 Jan	SWISS
21 Dec - 04 Jan	KLM
20 Dec - 04 Jan	SWISS

Also check the deals for one-way flights from London to Ljubljana 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 Ljubljana in December from $251

Return flights