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

Return flights

30 Sep - 04 Oct	Air France
30 Sep - 09 Oct	Transavia France
23 Sep - 25 Sep	Transavia France
27 Sep - 10 Oct	Transavia France
27 Sep - 11 Oct	Air Serbia
23 Sep - 30 Sep	SWISS
24 Sep - 30 Sep	SWISS
24 Sep - 01 Oct	SWISS
25 Sep - 01 Oct	SWISS
27 Sep - 02 Oct	Brussels Airlines
22 Sep - 30 Sep	SWISS
22 Sep - 24 Sep	Air Serbia
24 Sep - 27 Sep	SWISS
20 Sep - 26 Sep	SWISS
24 Sep - 26 Sep	SWISS
23 Sep - 27 Sep	SWISS
27 Sep - 30 Sep	Air Serbia
28 Sep - 03 Oct	Air Serbia

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 $241

Return flights