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

Return flights

28 Dec - 16 Jan	IndiGo
26 Dec - 31 Jan	IndiGo
02 Dec - 31 Jan	AirAsia
30 Dec - 27 Jan	AirAsia
28 Dec - 13 Jan	AirAsia
24 Dec - 31 Dec	AirAsia
31 Dec - 20 Jan	FitsAir
21 Dec - 06 Jan	AirAsia
31 Dec - 07 Jan	AirAsia
14 Dec - 04 Jan	IndiGo
01 Dec - 08 Dec	SriLankan Airlines
15 Dec - 04 Jan	SriLankan Airlines
23 Dec - 30 Dec	AirAsia
25 Dec - 30 Dec	AirAsia
02 Dec - 13 Dec	AirAsia
14 Dec - 30 Dec	AirAsia
21 Dec - 28 Dec	AirAsia
16 Dec - 30 Dec	AirAsia
19 Dec - 26 Dec	IndiGo
23 Dec - 28 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 525€

Return flights