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

Return flights

20 Sep - 15 Oct	Hawaiian Airlines
18 Sep - 23 Sep	Fiji Airways
16 Sep - 03 Oct	Fiji Airways
22 Sep - 06 Oct	Fiji Airways
19 Sep - 26 Sep	Fiji Airways
27 Sep - 12 Oct	Hawaiian Airlines
15 Sep - 22 Sep	Fiji Airways
18 Sep - 25 Sep	Fiji Airways
30 Sep - 22 Oct	Fiji Airways
20 Sep - 23 Sep	Fiji Airways
26 Sep - 29 Sep	Fiji Airways
16 Sep - 30 Sep	Fiji Airways
24 Sep - 30 Sep	Fiji Airways
27 Sep - 05 Oct	Fiji Airways
23 Sep - 01 Oct	Fiji Airways
21 Sep - 01 Oct	Fiji Airways
25 Sep - 12 Oct	Fiji Airways
27 Sep - 18 Oct	Hawaiian Airlines
17 Sep - 28 Sep	Delta	direct
15 Sep - 22 Sep	Delta	direct

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 657€

Return flights