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

Return flights

27 Sep - 29 Sep	Air Serbia
27 Sep - 03 Oct	Air Serbia
30 Sep - 07 Oct	Brussels Airlines
28 Sep - 03 Oct	Air Serbia
28 Sep - 04 Oct	Air Serbia
27 Sep - 01 Oct	Air Serbia
26 Sep - 03 Oct	SWISS
26 Sep - 04 Oct	SWISS
24 Sep - 03 Oct	Vueling Airlines
27 Sep - 02 Oct	Lufthansa
24 Sep - 02 Oct	Vueling Airlines
25 Sep - 30 Sep	Air Serbia
26 Sep - 30 Sep	SWISS
26 Sep - 29 Sep	SWISS
29 Sep - 30 Sep	KLM
25 Sep - 29 Sep	Air Serbia
22 Sep - 29 Sep	SWISS
27 Sep - 27 Sep	Lufthansa
22 Sep - 24 Sep	Air France
26 Sep - 28 Sep	SWISS

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 219€

Return flights