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

Return flights

22 Oct - 29 Oct	Air India
17 Oct - 27 Oct	IndiGo
28 Oct - 04 Nov	VietJet Air
13 Oct - 25 Oct	AirAsia X
20 Oct - 10 Nov	IndiGo
15 Oct - 25 Oct	Malaysia Airlines
20 Oct - 29 Oct	Malaysia Airlines
18 Oct - 25 Oct	Malaysia Airlines
19 Oct - 25 Oct	Malaysia Airlines
20 Oct - 25 Oct	Malaysia Airlines
31 Oct - 07 Nov	AirAsia X
31 Oct - 09 Nov	AirAsia X
26 Oct - 07 Nov	AirAsia X
26 Oct - 09 Nov	AirAsia X
21 Oct - 25 Oct	Malaysia Airlines
15 Oct - 18 Oct	Malaysia Airlines
24 Oct - 07 Nov	AirAsia X
24 Oct - 09 Nov	AirAsia X
22 Oct - 07 Nov	AirAsia X
22 Oct - 09 Nov	AirAsia X

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

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 October from $555

Return flights