AirHint found the following cheapest return flights from Bangkok (DMK) to Sydney (SYD) in September 2025 (see full year).

Return flights

22 Sep - 29 Sep	AirAsia
25 Sep - 24 Oct	Thai AirAsia
21 Sep - 24 Sep	Thai AirAsia
27 Sep - 10 Oct	Thai AirAsia
22 Sep - 27 Sep	Thai AirAsia
19 Sep - 23 Sep	Thai AirAsia
19 Sep - 26 Sep	Thai AirAsia
19 Sep - 22 Sep	Thai AirAsia
23 Sep - 29 Sep	Thai AirAsia
26 Sep - 11 Oct	Batik Air Malaysia
23 Sep - 30 Sep	Thai AirAsia
23 Sep - 28 Sep	Thai AirAsia
20 Sep - 22 Sep	Thai AirAsia
22 Sep - 12 Oct	AirAsia
22 Sep - 08 Oct	AirAsia
22 Sep - 11 Oct	AirAsia
22 Sep - 05 Oct	AirAsia
22 Sep - 10 Oct	AirAsia
25 Sep - 12 Oct	Thai AirAsia
30 Sep - 13 Oct	Batik Air Malaysia

Also check the deals for one-way flights from Bangkok to Sydney 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 Bangkok to Sydney in September from $469

Return flights