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

Return flights

09 Dec - 16 Dec	LOT
11 Dec - 16 Dec	Lufthansa
11 Dec - 18 Dec	Lufthansa
11 Dec - 17 Dec	Lufthansa
11 Dec - 14 Dec	Lufthansa
29 Dec - 25 Jan	Lufthansa
08 Dec - 14 Dec	Lufthansa
11 Dec - 15 Dec	Lufthansa
09 Dec - 13 Dec	Lufthansa
05 Dec - 10 Dec	Lufthansa
07 Dec - 11 Dec	SWISS
30 Dec - 06 Jan	Lufthansa
27 Dec - 31 Jan	Lufthansa
06 Dec - 10 Jan	SWISS
31 Dec - 07 Jan	SWISS
31 Dec - 09 Jan	SWISS
28 Dec - 23 Jan	Brussels Airlines
31 Dec - 05 Jan	SWISS
28 Dec - 24 Jan	Lufthansa
28 Dec - 25 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 168€

Return flights