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

Return flights

17 Sep - 23 Sep	Lufthansa
27 Sep - 30 Sep	Lufthansa
27 Sep - 01 Oct	Lufthansa
17 Sep - 27 Sep	Lufthansa
17 Sep - 25 Sep	Lufthansa
27 Sep - 07 Oct	Lufthansa
05 Sep - 11 Sep	SWISS
19 Sep - 29 Sep	Brussels Airlines
12 Sep - 19 Sep	Brussels Airlines
22 Sep - 02 Oct	Brussels Airlines
15 Sep - 26 Sep	Lufthansa
22 Sep - 26 Sep	Brussels Airlines
19 Sep - 24 Sep	Brussels Airlines
30 Sep - 04 Oct	Brussels Airlines
28 Sep - 03 Oct	Air Serbia
30 Sep - 06 Oct	Brussels Airlines
29 Sep - 04 Oct	SWISS
29 Sep - 03 Oct	SWISS
30 Sep - 10 Oct	Brussels Airlines
26 Sep - 05 Oct	Vueling Airlines

Also check the deals for one-way flights from London to Ljubljana in September.

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 September from 183€

Return flights