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

Return flights

19 Sep - 23 Sep	SWISS
29 Sep - 06 Oct	SWISS
30 Sep - 07 Oct	SWISS
30 Sep - 06 Oct	SWISS
04 Sep - 11 Sep	KLM
10 Sep - 16 Sep	SWISS
16 Sep - 22 Sep	SWISS
27 Sep - 30 Sep	Lufthansa
08 Sep - 15 Sep	SWISS
09 Sep - 16 Sep	SWISS
11 Sep - 16 Sep	Lufthansa
27 Sep - 01 Oct	Lufthansa
30 Sep - 02 Oct	Ryanair
17 Sep - 23 Sep	Lufthansa
02 Sep - 04 Sep	Ryanair
29 Sep - 05 Oct	KLM
30 Sep - 05 Oct	SWISS
29 Sep - 01 Oct	KLM

Also check the deals for one-way flights from Birmingham 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 Birmingham to Ljubljana in September from $226

Return flights