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

Return flights

26 Sep - 29 Sep	LOT	direct
08 Sep - 15 Sep	LOT	direct
17 Sep - 22 Sep	LOT	direct
15 Sep - 22 Sep	LOT	direct
10 Sep - 22 Sep	LOT	direct
18 Sep - 22 Sep	LOT	direct
19 Sep - 25 Sep	SWISS
19 Sep - 26 Sep	SWISS
05 Sep - 08 Sep	SWISS
26 Sep - 03 Oct	SWISS
07 Sep - 10 Sep	LOT	direct
26 Sep - 03 Oct	LOT	direct

Also check the deals for one-way flights from Warsaw 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 Warsaw to Ljubljana in September from 178€

Return flights