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

Return flights

15 Dec - 25 Dec	Philippine Airlines
05 Dec - 13 Dec	Batik Air Malaysia
03 Dec - 10 Dec	Malaysia Airlines
02 Dec - 10 Dec	Malaysia Airlines
06 Dec - 11 Dec	AirAsia X
06 Dec - 09 Dec	AirAsia X
01 Dec - 11 Dec	Malaysia Airlines
06 Dec - 10 Dec	AirAsia X
01 Dec - 09 Dec	AirAsia X
02 Dec - 11 Dec	AirAsia X
06 Dec - 31 Jan	Philippine Airlines
01 Dec - 07 Jan	Air India
08 Dec - 14 Jan	AirAsia X
02 Dec - 01 Jan	Malaysia Airlines
01 Dec - 14 Jan	Air India
01 Dec - 06 Jan	Air India
09 Dec - 05 Jan	AirAsia X
02 Dec - 03 Jan	Air India
28 Dec - 14 Jan	AirAsia X
30 Dec - 14 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 $790

Return flights