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

Return flights

23 Sep - 14 Oct	VietJet Air
30 Sep - 15 Oct	Turkish Airlines
28 Sep - 28 Oct	VietJet Air
23 Sep - 15 Oct	VietJet Air
22 Sep - 14 Oct	VietJet Air
23 Sep - 30 Sep	VietJet Air
23 Sep - 13 Oct	VietJet Air
26 Sep - 19 Oct	VietJet Air
30 Sep - 14 Oct	AirAsia X
23 Sep - 07 Oct	VietJet Air
24 Sep - 15 Oct	VietJet Air
19 Sep - 21 Sep	Scoot
19 Sep - 22 Sep	Jetstar
21 Sep - 30 Sep	Jetstar
26 Sep - 28 Sep	VietJet Air
19 Sep - 23 Sep	Jetstar
21 Sep - 28 Sep	Jetstar
19 Sep - 24 Sep	Jetstar
22 Sep - 29 Sep	Qantas
26 Sep - 29 Sep	VietJet Air

Also check the deals for one-way flights from Sydney to Dublin 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 Dublin in September from $1233

Return flights