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

Return flights

06 Sep - 10 Sep	AirAsia
06 Sep - 09 Sep	AirAsia
05 Sep - 10 Sep	AirAsia
05 Sep - 09 Sep	AirAsia
06 Sep - 12 Sep	AirAsia
06 Sep - 13 Sep	AirAsia
09 Sep - 12 Sep	AirAsia
09 Sep - 13 Sep	AirAsia
05 Sep - 12 Sep	AirAsia
05 Sep - 13 Sep	AirAsia
24 Sep - 14 Oct	AirAsia
24 Sep - 15 Oct	AirAsia
27 Sep - 14 Oct	AirAsia
26 Sep - 14 Oct	AirAsia
25 Sep - 14 Oct	AirAsia
27 Sep - 15 Oct	AirAsia
26 Sep - 15 Oct	AirAsia
25 Sep - 15 Oct	AirAsia
23 Sep - 11 Oct	AirAsia
24 Sep - 11 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 $663

Return flights