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

Return flights

02 Sep - 16 Sep	SWISS
17 Sep - 23 Sep	SWISS
02 Sep - 09 Sep	SWISS
25 Sep - 02 Oct	Transavia France
17 Sep - 20 Sep	SWISS
04 Sep - 09 Sep	SWISS
30 Sep - 06 Oct	Transavia France
22 Sep - 26 Sep	SWISS
22 Sep - 29 Sep	Air Serbia
13 Sep - 17 Sep	Transavia France
27 Sep - 30 Sep	SWISS
26 Sep - 29 Sep	SWISS
27 Sep - 06 Oct	SWISS
05 Sep - 03 Oct	KLM
28 Sep - 07 Oct	Turkish Airlines
28 Sep - 06 Oct	Turkish Airlines
28 Sep - 02 Oct	Turkish Airlines

Also check the deals for one-way flights from Ljubljana to Lisbon 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 Ljubljana to Lisbon in September from 209€

Return flights