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

Return flights

06 Sep - 21 Sep	Hawaiian Airlines
06 Sep - 14 Sep	Hawaiian Airlines
22 Sep - 01 Oct	Fiji Airways
04 Sep - 14 Sep	ANA
28 Sep - 07 Oct	ANA
28 Sep - 08 Oct	ANA
02 Sep - 14 Sep	ANA
04 Sep - 10 Sep	Hawaiian Airlines
27 Sep - 28 Oct	Alaska Airlines
25 Sep - 12 Oct	Fiji Airways
29 Sep - 20 Oct	Air Canada
15 Sep - 01 Oct	Fiji Airways
05 Sep - 16 Sep	Fiji Airways
11 Sep - 19 Sep	Hawaiian Airlines
04 Sep - 21 Sep	Hawaiian Airlines
01 Sep - 08 Sep	Air New Zealand
22 Sep - 29 Sep	Air New Zealand
18 Sep - 01 Oct	Fiji Airways
12 Sep - 10 Oct	Qantas
26 Sep - 24 Oct	Qantas

Also check the deals for one-way flights from Los Angeles 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 Los Angeles to Sydney in September from $713

Return flights