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

Return flights

10 Dec - 14 Jan	Air India
11 Dec - 24 Jan	Singapore Airlines
26 Dec - 15 Jan	AirAsia X
29 Dec - 15 Jan	AirAsia X
18 Dec - 31 Dec	Thai AirAsia X
31 Dec - 15 Jan	AirAsia X
29 Dec - 18 Jan	AirAsia X
26 Dec - 16 Jan	AirAsia X
29 Dec - 17 Jan	AirAsia X
29 Dec - 19 Jan	AirAsia X
24 Dec - 10 Jan	AirAsia X
01 Dec - 05 Dec	AirAsia X
01 Dec - 07 Dec	AirAsia X
01 Dec - 09 Dec	AirAsia X
03 Dec - 07 Dec	AirAsia X
03 Dec - 09 Dec	AirAsia X
05 Dec - 09 Dec	AirAsia X
07 Dec - 09 Dec	AirAsia X
01 Dec - 08 Dec	Malaysia Airlines
09 Dec - 30 Dec	Malaysia Airlines

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 470€

Return flights