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

Return flights

27 Sep - 04 Oct	Transavia France
30 Sep - 03 Oct	Transavia France
27 Sep - 30 Sep	Transavia France
23 Sep - 30 Sep	Transavia France
27 Sep - 11 Oct	Transavia France
02 Sep - 30 Sep	SWISS
09 Sep - 16 Sep	SWISS
16 Sep - 23 Sep	Transavia France
30 Sep - 07 Oct	Transavia France
30 Sep - 06 Oct	Transavia France
03 Sep - 30 Sep	SWISS
10 Sep - 17 Sep	SWISS
29 Sep - 07 Oct	SWISS
04 Sep - 11 Sep	Transavia France
04 Sep - 01 Oct	Transavia France
16 Sep - 24 Sep	SWISS
06 Sep - 11 Sep	SWISS

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 173€

Return flights