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

Return flights

10 Sep - 17 Sep	AirAsia
01 Sep - 17 Sep	AirAsia
19 Sep - 23 Sep	AirAsia
28 Sep - 05 Oct	AirAsia
07 Sep - 14 Sep	AirAsia
27 Sep - 04 Oct	AirAsia
02 Sep - 09 Sep	IndiGo
20 Sep - 23 Sep	AirAsia
24 Sep - 14 Oct	AirAsia
24 Sep - 04 Oct	AirAsia
20 Sep - 04 Oct	AirAsia
15 Sep - 23 Sep	AirAsia
16 Sep - 23 Sep	AirAsia
15 Sep - 04 Oct	AirAsia
24 Sep - 08 Oct	AirAsia
24 Sep - 07 Oct	AirAsia
24 Sep - 02 Oct	AirAsia
24 Sep - 09 Oct	AirAsia
03 Sep - 10 Sep	AirAsia
15 Sep - 17 Sep	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 475€

Return flights