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

Return flights

02 Dec - 12 Dec	United
10 Dec - 20 Dec	United
29 Dec - 11 Jan	Air Canada
06 Dec - 14 Dec	Air Canada
15 Dec - 28 Jan	Air Canada
04 Dec - 18 Dec	United
10 Dec - 06 Jan	United
26 Dec - 07 Jan	Air Canada
26 Dec - 06 Jan	Air Canada
23 Dec - 13 Jan	Air Canada
27 Dec - 17 Jan	Air Canada
28 Dec - 16 Jan	Turkish Airlines
28 Dec - 17 Jan	United
12 Dec - 31 Dec	United
25 Dec - 09 Jan	United
01 Dec - 08 Dec	Air Canada
13 Dec - 26 Dec	United
13 Dec - 27 Dec	United
16 Dec - 30 Dec	United

Also check the deals for one-way flights from Newark to Sydney in December.

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 December from 1017€

Return flights