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

Return flights

30 Oct - 06 Nov	IndiGo
21 Oct - 26 Oct	IndiGo
06 Oct - 25 Oct	IndiGo
22 Oct - 26 Oct	IndiGo
23 Oct - 26 Oct	IndiGo
24 Oct - 31 Oct	IndiGo
08 Oct - 10 Oct	AirAsia X
20 Oct - 24 Oct	AirAsia X
28 Oct - 04 Nov	VietJet Air
21 Oct - 10 Nov	VietJet Air
15 Oct - 13 Nov	Air India
05 Oct - 25 Oct	Air India
01 Oct - 09 Oct	Air India
03 Oct - 15 Oct	AirAsia X
22 Oct - 12 Nov	AirAsia X
20 Oct - 10 Nov	IndiGo
26 Oct - 09 Nov	AirAsia X
31 Oct - 09 Nov	AirAsia X
15 Oct - 09 Nov	AirAsia X
31 Oct - 18 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 426€

Return flights