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

Return flights

28 Sep - 04 Oct	Air Serbia
27 Sep - 04 Oct	Air Serbia
20 Sep - 04 Oct	Air Serbia
27 Sep - 11 Oct	Air Serbia
29 Sep - 08 Oct	SWISS
25 Sep - 01 Oct	SWISS
22 Sep - 29 Sep	SWISS
23 Sep - 29 Sep	SWISS
25 Sep - 30 Sep	SWISS
16 Sep - 23 Sep	SWISS
16 Sep - 24 Sep	SWISS
23 Sep - 30 Sep	SWISS
16 Sep - 30 Sep	SWISS
22 Sep - 04 Oct	Brussels Airlines
27 Sep - 01 Oct	Brussels Airlines
27 Sep - 03 Oct	Brussels Airlines
24 Sep - 02 Oct	Brussels Airlines
01 Sep - 05 Sep	Brussels Airlines
22 Sep - 27 Sep	Brussels Airlines
27 Sep - 30 Sep	Brussels 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 $204

Return flights