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

Return flights

17 Sep - 23 Oct	Air France
16 Sep - 29 Sep	KLM
17 Sep - 20 Sep	Air France
26 Sep - 11 Oct	KLM
16 Sep - 02 Oct	KLM
25 Sep - 08 Oct	Air Serbia
16 Sep - 03 Oct	Turkish Airlines
22 Sep - 30 Sep	Air Serbia
25 Sep - 30 Sep	Air Serbia
24 Sep - 10 Oct	Turkish Airlines
15 Sep - 09 Oct	Turkish Airlines
18 Sep - 25 Sep	Air Serbia
20 Sep - 30 Sep	Turkish Airlines
30 Sep - 09 Oct	Transavia France
30 Sep - 04 Oct	Turkish Airlines
19 Sep - 26 Sep	Emirates

Also check the deals for one-way flights from Ljubljana to Bangkok 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 Bangkok in September from $649

Return flights