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

Return flights

07 Sep - 05 Oct	Air Canada
07 Sep - 06 Oct	Air Canada
14 Sep - 30 Sep	Air Canada
15 Sep - 29 Sep	United
14 Sep - 29 Sep	United
15 Sep - 22 Sep	United
28 Sep - 07 Oct	United
01 Sep - 30 Sep	United
08 Sep - 07 Oct	United
10 Sep - 07 Oct	United
03 Sep - 01 Oct	United
09 Sep - 16 Sep	United
10 Sep - 23 Sep	United
07 Sep - 04 Oct	Air Canada
14 Sep - 28 Sep	Air Canada
13 Sep - 17 Oct	Hawaiian Airlines
10 Sep - 17 Oct	Hawaiian Airlines
10 Sep - 28 Sep	Air Canada
01 Sep - 07 Sep	Air Canada
06 Sep - 04 Oct	Air Canada

Also check the deals for one-way flights from Newark 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 Newark to Sydney in September from 825€

Return flights