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

Return flights

05 Sep - 21 Oct	Malaysia Airlines
09 Sep - 21 Sep	Scoot
04 Sep - 18 Sep	Malaysia Airlines
02 Sep - 13 Sep	Philippine Airlines
07 Sep - 21 Sep	Scoot
13 Sep - 21 Sep	AirAsia X
12 Sep - 21 Sep	VietJet Air
16 Sep - 20 Sep	AirAsia X
02 Sep - 19 Sep	AirAsia X
19 Sep - 19 Oct	AirAsia X
17 Sep - 20 Sep	AirAsia X
19 Sep - 24 Sep	AirAsia X
17 Sep - 03 Oct	AirAsia X
16 Sep - 01 Oct	AirAsia X
17 Sep - 01 Oct	AirAsia X
28 Sep - 17 Oct	AirAsia X
30 Sep - 17 Oct	AirAsia X
13 Sep - 01 Oct	AirAsia X
12 Sep - 01 Oct	AirAsia X
11 Sep - 01 Oct	AirAsia X

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 450€

Return flights