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

Return flights

02 Sep - 13 Sep	Scoot Tigerair
12 Sep - 20 Sep	AirAsia X
12 Sep - 21 Sep	AirAsia X
11 Sep - 18 Sep	AirAsia X
11 Sep - 23 Sep	AirAsia X
11 Sep - 19 Sep	AirAsia X
12 Sep - 18 Sep	AirAsia X
12 Sep - 23 Sep	AirAsia X
12 Sep - 19 Sep	AirAsia X
11 Sep - 20 Sep	AirAsia X
11 Sep - 02 Oct	AirAsia X
12 Sep - 02 Oct	AirAsia X
13 Sep - 02 Oct	AirAsia X
14 Sep - 02 Oct	AirAsia X
14 Sep - 24 Oct	AirAsia X
23 Sep - 21 Oct	Singapore Airlines
22 Sep - 20 Oct	Singapore Airlines
04 Sep - 03 Oct	AirAsia X
13 Sep - 03 Oct	AirAsia X
13 Sep - 31 Oct	Singapore Airlines

Also check the deals for one-way flights from Sydney to Colombo 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 Sydney to Colombo in September from 451€

Return flights