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

Return flights

06 Dec - 09 Dec	Vueling Airlines
09 Dec - 15 Dec	Air Serbia
02 Dec - 04 Dec	Air Serbia
26 Dec - 29 Dec	Air Serbia
05 Dec - 08 Dec	Air Serbia
12 Dec - 15 Dec	Air Serbia
14 Dec - 18 Dec	Aegean Airlines
03 Dec - 08 Dec	Air Serbia
04 Dec - 06 Dec	Lufthansa
11 Dec - 15 Dec	Lufthansa
25 Dec - 01 Jan	Lufthansa
13 Dec - 07 Jan	KLM
27 Dec - 05 Jan	Brussels Airlines
26 Dec - 02 Jan	Lufthansa
28 Dec - 02 Jan	Brussels Airlines
30 Dec - 02 Jan	Air Serbia
31 Dec - 04 Jan	SWISS
30 Dec - 04 Jan	Lufthansa
27 Dec - 02 Jan	Brussels Airlines
24 Dec - 01 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 157€

Return flights