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

Return flights

30 Dec - 06 Jan	Lufthansa
04 Dec - 08 Dec	SWISS
25 Dec - 28 Dec	Lufthansa
27 Dec - 10 Jan	Lufthansa
03 Dec - 07 Dec	SWISS
03 Dec - 10 Dec	SWISS
01 Dec - 05 Dec	Brussels Airlines
08 Dec - 11 Dec	KLM
31 Dec - 07 Jan	KLM
11 Dec - 14 Dec	KLM
11 Dec - 15 Dec	Lufthansa
12 Dec - 14 Dec	Brussels Airlines
29 Dec - 02 Jan	Brussels Airlines
28 Dec - 04 Jan	Brussels Airlines
15 Dec - 20 Dec	Brussels Airlines
30 Dec - 03 Jan	Lufthansa
26 Dec - 05 Jan	Lufthansa
18 Dec - 02 Jan	Lufthansa
27 Dec - 03 Jan	Lufthansa
18 Dec - 05 Jan	Lufthansa

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 $214

Return flights