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

Return flights

26 Sep - 30 Sep	Vueling Airlines
24 Sep - 08 Oct	Vueling Airlines
19 Sep - 23 Sep	Transavia France
17 Sep - 23 Sep	Transavia France
22 Sep - 30 Sep	Vueling Airlines
09 Sep - 16 Sep	Transavia France
25 Sep - 29 Sep	Vueling Airlines
26 Sep - 29 Sep	Vueling Airlines
24 Sep - 29 Sep	Vueling Airlines
20 Sep - 03 Oct	Transavia France
23 Sep - 03 Oct	Ryanair
18 Sep - 21 Sep	SWISS
14 Sep - 16 Sep	Wizz Air

Also check the deals for one-way flights from Lisbon 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 Lisbon to Ljubljana in September from $264

Return flights