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

Return flights

05 Sep - 09 Sep	AirAsia
02 Sep - 09 Sep	AirAsia
02 Sep - 07 Sep	AirAsia
25 Sep - 24 Oct	Cebu Pacific
02 Sep - 05 Sep	AirAsia
03 Sep - 09 Sep	AirAsia
03 Sep - 07 Sep	AirAsia
05 Sep - 16 Sep	AirAsia
01 Sep - 08 Sep	Thai Lion Air
22 Sep - 12 Oct	AirAsia
04 Sep - 09 Sep	AirAsia
04 Sep - 07 Sep	AirAsia
09 Sep - 09 Oct	Thai AirAsia
23 Sep - 12 Oct	AirAsia
30 Sep - 18 Oct	AirAsia
25 Sep - 12 Oct	AirAsia
24 Sep - 12 Oct	AirAsia
27 Sep - 12 Oct	AirAsia
30 Sep - 12 Oct	AirAsia
22 Sep - 14 Oct	Philippines AirAsia Inc.

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 $381

Return flights