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

Return flights

05 Sep - 09 Sep	IndiGo
04 Sep - 11 Sep	VietJet Air
02 Sep - 09 Sep	Air India
02 Sep - 11 Sep	VietJet Air
03 Sep - 12 Sep	Air India
05 Sep - 12 Sep	Air India
04 Sep - 08 Sep	VietJet Air
11 Sep - 02 Oct	VietJet Air
12 Sep - 03 Oct	Air India
01 Sep - 02 Sep	VietJet Air
02 Sep - 10 Sep	IndiGo
01 Sep - 10 Sep	VietJet Air
18 Sep - 09 Oct	VietJet Air
01 Sep - 06 Oct	VietJet Air
02 Sep - 07 Oct	VietJet Air
15 Sep - 13 Oct	IndiGo
18 Sep - 15 Oct	IndiGo
16 Sep - 07 Oct	VietJet Air
18 Sep - 13 Oct	VietJet Air
22 Sep - 13 Oct	IndiGo

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 $439

Return flights