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

Return flights

14 Sep - 21 Sep	Air India
23 Sep - 22 Oct	Air India
15 Sep - 18 Oct	IndiGo
20 Sep - 23 Oct	Air India
18 Sep - 09 Oct	Air India
15 Sep - 21 Sep	IndiGo
15 Sep - 17 Sep	IndiGo
22 Sep - 20 Oct	VietJet Air
14 Sep - 27 Oct	Air India
21 Sep - 28 Sep	AirAsia X
14 Sep - 18 Sep	IndiGo
16 Sep - 30 Sep	Air India
13 Sep - 21 Sep	Air India
13 Sep - 17 Sep	Air India
22 Sep - 17 Oct	VietJet Air
14 Sep - 16 Sep	IndiGo
22 Sep - 08 Oct	VietJet Air
23 Sep - 31 Oct	Air India
19 Sep - 24 Sep	AirAsia X
24 Sep - 01 Oct	AirAsia X

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

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 September from 441€

Return flights