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

Return flights

02 Dec - 11 Dec	Lufthansa
02 Dec - 12 Dec	Lufthansa
01 Dec - 08 Dec	SWISS
01 Dec - 11 Dec	SWISS
01 Dec - 09 Dec	Brussels Airlines
03 Dec - 11 Dec	SWISS
05 Dec - 08 Dec	SWISS
03 Dec - 06 Dec	SWISS
03 Dec - 08 Dec	SWISS
10 Dec - 13 Dec	SWISS
30 Dec - 05 Jan	Lufthansa
30 Dec - 04 Jan	Lufthansa
27 Dec - 02 Jan	Lufthansa
28 Dec - 04 Jan	Brussels Airlines
26 Dec - 02 Jan	Lufthansa
26 Dec - 01 Jan	Lufthansa
27 Dec - 03 Jan	Lufthansa
27 Dec - 04 Jan	Lufthansa
19 Dec - 05 Jan	Lufthansa
28 Dec - 03 Jan	Brussels Airlines

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 180€

Return flights