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

Return flights

27 Sep - 04 Oct	AirAsia
28 Sep - 05 Oct	AirAsia
03 Sep - 10 Sep	IndiGo
02 Sep - 09 Sep	IndiGo
01 Sep - 08 Sep	AirAsia
07 Sep - 14 Sep	AirAsia
06 Sep - 13 Sep	AirAsia
26 Sep - 03 Oct	AirAsia
21 Sep - 28 Sep	AirAsia
09 Sep - 16 Sep	AirAsia
05 Sep - 12 Sep	AirAsia
29 Sep - 06 Oct	AirAsia
04 Sep - 11 Sep	Air India
20 Sep - 05 Oct	AirAsia
20 Sep - 07 Oct	AirAsia
17 Sep - 24 Sep	AirAsia
20 Sep - 10 Oct	AirAsia
19 Sep - 05 Oct	AirAsia
19 Sep - 07 Oct	AirAsia
19 Sep - 04 Oct	AirAsia

Also check the deals for one-way flights from Colombo 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 Colombo to Sydney in September from $525

Return flights