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

Return flights

24 Sep - 28 Oct	VietJet Air
24 Sep - 22 Oct	VietJet Air
27 Sep - 28 Oct	VietJet Air
25 Sep - 27 Oct	VietJet Air
29 Sep - 28 Oct	VietJet Air
25 Sep - 28 Oct	VietJet Air
29 Sep - 27 Oct	VietJet Air
30 Sep - 20 Oct	SriLankan Airlines
30 Sep - 15 Oct	AirAsia X
25 Sep - 15 Oct	AirAsia X
24 Sep - 27 Sep	VietJet Air
21 Sep - 25 Sep	SriLankan Airlines
24 Sep - 29 Sep	AirAsia X
25 Sep - 29 Sep	AirAsia X
22 Sep - 30 Sep	VietJet Air
22 Sep - 26 Sep	VietJet Air
23 Sep - 30 Sep	VietJet Air
25 Sep - 28 Sep	VietJet Air
23 Sep - 29 Sep	AirAsia X
20 Sep - 24 Sep	Scoot

Also check the deals for one-way flights from Sydney to Delhi 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 Sydney to Delhi in September from $663

Return flights