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

Return flights

30 Dec - 13 Jan	Air Canada
31 Dec - 19 Jan	Air Canada
31 Dec - 16 Jan	Air Canada
31 Dec - 17 Jan	Air Canada
31 Dec - 14 Jan	Air Canada
31 Dec - 20 Jan	Spirit Airlines
27 Dec - 16 Jan	Spirit Airlines
31 Dec - 18 Jan	Air Canada
25 Dec - 31 Dec	Spirit Airlines
29 Dec - 12 Jan	Air Canada
24 Dec - 14 Jan	United
24 Dec - 31 Dec	Spirit Airlines
23 Dec - 30 Dec	Spirit Airlines
24 Dec - 27 Dec	jetBlue
21 Dec - 27 Dec	Air Canada
21 Dec - 29 Dec	Sun Country Airlines
22 Dec - 26 Dec	Air Canada
17 Dec - 31 Dec	Spirit Airlines
29 Dec - 31 Dec	Spirit Airlines
17 Dec - 20 Dec	Air Canada

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 $1283

Return flights