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

Return flights

27 Dec - 06 Jan	Lufthansa
11 Dec - 13 Dec	Lufthansa
28 Dec - 07 Jan	SWISS
28 Dec - 25 Jan	SWISS
11 Dec - 17 Dec	Lufthansa
15 Dec - 20 Dec	LOT
26 Dec - 29 Dec	Lufthansa
11 Dec - 18 Dec	Lufthansa
26 Dec - 30 Dec	LOT
11 Dec - 16 Dec	Lufthansa
11 Dec - 14 Dec	Lufthansa
11 Dec - 15 Dec	Lufthansa
10 Dec - 17 Dec	SWISS
31 Dec - 05 Jan	SWISS
26 Dec - 01 Jan	Lufthansa
27 Dec - 02 Jan	LOT
29 Dec - 02 Jan	LOT
30 Dec - 02 Jan	LOT
31 Dec - 02 Jan	SWISS
26 Dec - 03 Jan	LOT

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 192€

Return flights