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

Return flights

10 Sep - 12 Sep	Ryanair
01 Sep - 05 Sep	easyJet
17 Sep - 29 Sep	Ryanair
17 Sep - 22 Sep	Ryanair
07 Sep - 12 Sep	Ryanair
10 Sep - 15 Sep	Ryanair
08 Sep - 12 Sep	easyJet
13 Sep - 14 Sep	Ryanair
14 Sep - 18 Sep	Ryanair
25 Sep - 29 Sep	Ryanair
28 Sep - 02 Oct	Ryanair
27 Sep - 02 Oct	easyJet
29 Sep - 03 Oct	easyJet
24 Sep - 01 Oct	Ryanair
01 Sep - 17 Oct	easyJet
27 Sep - 01 Oct	easyJet
23 Sep - 01 Oct	Ryanair
30 Sep - 04 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 $269

Return flights