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

Return flights

19 Aug - 17 Sep	Air India
30 Aug - 03 Sep	IndiGo
30 Aug - 12 Sep	Air India
22 Aug - 24 Aug	Air India
23 Aug - 24 Sep	Air India
26 Aug - 03 Sep	VietJet Air
16 Aug - 17 Sep	IndiGo
20 Aug - 27 Aug	Air India
25 Aug - 01 Sep	VietJet Air
17 Aug - 23 Sep	IndiGo
19 Aug - 27 Aug	VietJet Air
16 Aug - 19 Aug	IndiGo
29 Aug - 31 Aug	Air India
25 Aug - 05 Sep	AirAsia X
27 Aug - 05 Sep	AirAsia X
25 Aug - 29 Aug	AirAsia X
25 Aug - 27 Aug	AirAsia X
27 Aug - 29 Aug	AirAsia X
17 Aug - 22 Aug	IndiGo
25 Aug - 31 Aug	AirAsia X

Also check the deals for one-way flights from Delhi to Sydney in August.

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 August from 455€

Return flights