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

Return flights

02 Dec - 17 Dec	AirAsia X
02 Dec - 18 Dec	AirAsia X
02 Dec - 19 Dec	VietJet Air
01 Dec - 17 Dec	AirAsia X
02 Dec - 12 Dec	AirAsia X
02 Dec - 11 Dec	AirAsia X
02 Dec - 10 Dec	AirAsia X
02 Dec - 09 Dec	AirAsia X
03 Dec - 12 Dec	AirAsia X
02 Dec - 14 Dec	AirAsia X
31 Dec - 11 Jan	AirAsia X
11 Dec - 01 Jan	VietJet Air
31 Dec - 28 Jan	AirAsia X
31 Dec - 20 Jan	AirAsia X
02 Dec - 19 Jan	AirAsia X
13 Dec - 01 Jan	AirAsia X
31 Dec - 13 Jan	AirAsia X
30 Dec - 14 Jan	AirAsia X
30 Dec - 10 Jan	AirAsia X
31 Dec - 26 Jan	AirAsia X

Also check the deals for one-way flights from Sydney to Colombo in December.

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 December from $703

Return flights