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

Return flights

08 Sep - 17 Sep	Frontier Airlines
10 Sep - 17 Sep	Frontier Airlines
09 Sep - 16 Sep	Frontier Airlines
17 Sep - 24 Sep	Frontier Airlines
08 Sep - 15 Sep	Frontier Airlines
09 Sep - 30 Sep	Air Canada
07 Sep - 14 Sep	Air Canada
07 Sep - 21 Sep	Asiana Airlines
23 Sep - 30 Sep	Frontier Airlines
04 Sep - 15 Oct	Frontier Airlines
24 Sep - 30 Sep	jetBlue
22 Sep - 07 Oct	Spirit Airlines
25 Sep - 22 Oct	Asiana Airlines
22 Sep - 08 Oct	Air Canada
21 Sep - 07 Oct	Air Canada
22 Sep - 09 Oct	Air Canada
29 Sep - 06 Oct	Hawaiian Airlines
29 Sep - 12 Oct	Hawaiian Airlines
25 Sep - 06 Oct	Cathay Pacific

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 $942

Return flights