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

Return flights

26 Dec - 31 Dec	Lufthansa
16 Dec - 23 Dec	KLM
29 Dec - 05 Jan	SWISS
31 Dec - 05 Jan	SWISS
24 Dec - 29 Dec	SWISS
15 Dec - 22 Dec	SWISS
28 Dec - 31 Dec	SWISS
29 Dec - 31 Dec	SWISS
29 Dec - 02 Jan	Lufthansa
17 Dec - 19 Dec	KLM
16 Dec - 19 Dec	KLM
24 Dec - 28 Dec	SWISS
30 Dec - 05 Jan	SWISS
28 Dec - 01 Jan	SWISS
29 Dec - 01 Jan	SWISS
26 Dec - 02 Jan	Lufthansa
15 Dec - 17 Dec	KLM
30 Dec - 01 Jan	SWISS
31 Dec - 01 Jan	SWISS
31 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 $363

Return flights