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

Return flights

23 Sep - 28 Sep	Ryanair
23 Sep - 01 Oct	Lufthansa
04 Sep - 10 Sep	Ryanair
25 Sep - 29 Sep	Ryanair
25 Sep - 28 Sep	Ryanair
21 Sep - 28 Sep	Ryanair
06 Sep - 10 Sep	Ryanair
04 Sep - 14 Sep	Ryanair
20 Sep - 22 Sep	Ryanair
16 Sep - 22 Sep	Ryanair
06 Sep - 17 Sep	Ryanair
26 Sep - 01 Oct	Lufthansa
25 Sep - 02 Oct	Ryanair
29 Sep - 08 Oct	Lufthansa
30 Sep - 08 Oct	Ryanair
21 Sep - 03 Oct	Ryanair
30 Sep - 07 Oct	Ryanair
26 Sep - 06 Oct	Ryanair
26 Sep - 03 Oct	Ryanair
29 Sep - 02 Oct	Ryanair

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 193€

Return flights