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	SWISS
29 Sep - 04 Oct	SWISS
19 Sep - 21 Sep	SWISS
29 Sep - 03 Oct	SWISS
29 Sep - 03 Oct	LOT	direct
26 Sep - 29 Sep	LOT	direct
16 Sep - 29 Sep	LOT	direct
26 Sep - 28 Sep	SWISS
30 Sep - 03 Oct	LOT	direct
28 Sep - 03 Oct	LOT	direct
30 Sep - 04 Oct	SWISS
16 Sep - 20 Sep	SWISS
25 Sep - 29 Sep	LOT	direct
04 Sep - 09 Sep	KLM
29 Sep - 30 Sep	LOT
05 Sep - 09 Sep	SWISS
29 Sep - 04 Oct	LOT	direct
29 Sep - 02 Oct	LOT
29 Sep - 01 Oct	LOT
29 Sep - 01 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 $214

Return flights