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

Return flights

03 Sep - 05 Sep	Air India
03 Sep - 03 Oct	Air India
23 Sep - 26 Oct	Air India
19 Sep - 23 Sep	Air India
16 Sep - 30 Sep	IndiGo
19 Sep - 02 Oct	Air India
29 Sep - 06 Oct	Thai AirAsia X
18 Sep - 02 Oct	Air India
16 Sep - 27 Oct	Air India
19 Sep - 03 Oct	VietJet Air
03 Sep - 09 Sep	Air India	direct
19 Sep - 03 Oct	Air India	direct
26 Sep - 02 Oct	Air India	direct
02 Sep - 09 Sep	Air India	direct
24 Sep - 04 Oct	Air India	direct
05 Sep - 09 Sep	Air India	direct
03 Sep - 10 Sep	Air India	direct
03 Sep - 17 Sep	Air India	direct
05 Sep - 24 Sep	AirAsia X
08 Sep - 24 Sep	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 431€

Return flights