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

Return flights

16 Sep - 21 Oct	Ryanair
16 Sep - 22 Oct	Ryanair
02 Sep - 09 Sep	Ryanair
22 Sep - 20 Oct	Ryanair
01 Sep - 07 Sep	Ryanair
22 Sep - 14 Oct	Ryanair
30 Sep - 21 Oct	Ryanair
18 Sep - 21 Oct	Ryanair
17 Sep - 22 Oct	Ryanair
01 Sep - 20 Oct	KLM
09 Sep - 16 Sep	British Airways
15 Sep - 22 Oct	Ryanair
01 Sep - 08 Sep	Ryanair
15 Sep - 07 Oct	Aer Lingus
24 Sep - 30 Sep	Aer Lingus
10 Sep - 23 Sep	Ryanair
16 Sep - 29 Sep	Ryanair
09 Sep - 14 Sep	Ryanair
04 Sep - 11 Sep	Ryanair
06 Sep - 30 Sep	Ryanair

Also check the deals for one-way flights from Dublin 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 Dublin to Sydney in September from 792€

Return flights