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

Return flights

27 Dec - 19 Jan	AirAsia
26 Dec - 17 Jan	Thai AirAsia
09 Dec - 30 Jan	AirAsia
07 Dec - 31 Jan	AirAsia
25 Dec - 16 Jan	Thai AirAsia
27 Dec - 16 Jan	AirAsia
28 Dec - 16 Jan	Thai AirAsia
30 Dec - 27 Jan	AirAsia
19 Dec - 10 Jan	AirAsia
19 Dec - 17 Jan	AirAsia
06 Dec - 13 Dec	Thai AirAsia
03 Dec - 10 Dec	SriLankan Airlines
14 Dec - 30 Dec	AirAsia
24 Dec - 31 Dec	AirAsia
19 Dec - 26 Dec	AirAsia
23 Dec - 30 Dec	AirAsia
22 Dec - 29 Dec	AirAsia
21 Dec - 28 Dec	AirAsia
09 Dec - 16 Dec	IndiGo
05 Dec - 27 Dec	AirAsia

Also check the deals for one-way flights from Colombo to Sydney 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 Colombo to Sydney in December from 517€

Return flights