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

Return flights

15 Sep - 22 Sep	United
28 Sep - 07 Oct	United
01 Sep - 30 Sep	United
08 Sep - 07 Oct	United
07 Sep - 06 Oct	United
10 Sep - 07 Oct	United
03 Sep - 01 Oct	United
09 Sep - 16 Sep	United
10 Sep - 23 Sep	United
07 Sep - 05 Oct	Air Canada
14 Sep - 30 Sep	United
06 Sep - 05 Oct	Air Canada
07 Sep - 04 Oct	Air Canada
25 Sep - 06 Oct	United
27 Sep - 07 Oct	United
10 Sep - 28 Sep	United
14 Sep - 28 Sep	United
11 Sep - 25 Sep	Air Canada
01 Sep - 07 Sep	Air Canada
04 Sep - 13 Sep	United

Also check the deals for one-way flights from New York 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 New York to Sydney in September from 847€

Return flights