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

Return flights

06 Dec - 08 Dec	SWISS
11 Dec - 14 Dec	SWISS
05 Dec - 08 Dec	SWISS
06 Dec - 09 Dec	SWISS
03 Dec - 08 Dec	SWISS
05 Dec - 07 Dec	SWISS
12 Dec - 15 Dec	SWISS
12 Dec - 14 Dec	SWISS
03 Dec - 07 Dec	SWISS
02 Dec - 07 Dec	SWISS
26 Dec - 06 Jan	KLM
31 Dec - 05 Jan	KLM
24 Dec - 01 Jan	KLM
30 Dec - 07 Jan	SWISS
26 Dec - 02 Jan	Lufthansa
30 Dec - 03 Jan	SWISS
30 Dec - 02 Jan	SWISS
19 Dec - 05 Jan	KLM
30 Dec - 04 Jan	KLM
19 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 $252

Return flights