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

Return flights

01 Dec - 31 Jan	Singapore Airlines
17 Dec - 30 Jan	VietJet Air
06 Dec - 25 Jan	Singapore Airlines
15 Dec - 22 Jan	Singapore Airlines
19 Dec - 31 Dec	VietJet Air
25 Dec - 31 Dec	VietJet Air
04 Dec - 09 Jan	VietJet Air
26 Dec - 18 Jan	AirAsia X
24 Dec - 07 Jan	VietJet Air
01 Dec - 31 Jan	Air India	direct
26 Dec - 16 Jan	AirAsia X
26 Dec - 15 Jan	AirAsia X
01 Dec - 10 Dec	VietJet Air
01 Dec - 09 Dec	AirAsia X
01 Dec - 05 Dec	AirAsia X
03 Dec - 04 Dec	Air India	direct
09 Dec - 15 Dec	Air India	direct
01 Dec - 14 Dec	AirAsia X
05 Dec - 09 Dec	AirAsia X
07 Dec - 09 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 530€

Return flights