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

Return flights

17 Dec - 18 Jan	AirAsia X
17 Dec - 19 Jan	AirAsia X
19 Dec - 19 Jan	AirAsia X
17 Dec - 16 Jan	AirAsia X
07 Dec - 18 Jan	AirAsia X
19 Dec - 15 Jan	AirAsia X
28 Dec - 15 Jan	AirAsia X
28 Dec - 25 Jan	AirAsia X
12 Dec - 24 Jan	AirAsia X
14 Dec - 24 Jan	AirAsia X
02 Dec - 09 Dec	IndiGo
04 Dec - 06 Dec	SriLankan Airlines
01 Dec - 07 Dec	AirAsia X
03 Dec - 07 Dec	AirAsia X
01 Dec - 06 Dec	SriLankan Airlines
01 Dec - 09 Dec	AirAsia X
01 Dec - 31 Dec	AirAsia X
08 Dec - 28 Dec	AirAsia X
07 Dec - 12 Dec	AirAsia X
19 Dec - 27 Dec	AirAsia X

Also check the deals for one-way flights from Delhi 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 Delhi to Sydney in December from $440

Return flights