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

Return flights

02 Dec - 09 Dec	United
30 Dec - 13 Jan	United
07 Dec - 14 Dec	United
30 Dec - 14 Jan	United
01 Dec - 13 Dec	United
11 Dec - 23 Dec	Air Canada
01 Dec - 22 Dec	Air Canada
31 Dec - 18 Jan	United
31 Dec - 29 Jan	United
01 Dec - 12 Dec	United
10 Dec - 29 Dec	United
10 Dec - 24 Dec	United
10 Dec - 19 Dec	United
11 Dec - 14 Dec	jetBlue
08 Dec - 21 Jan	ANA
11 Dec - 06 Jan	Air Canada
24 Dec - 28 Jan	Frontier Airlines
24 Dec - 15 Jan	Frontier Airlines
28 Dec - 11 Jan	Frontier Airlines
29 Dec - 20 Jan	Frontier Airlines

Also check the deals for one-way flights from New York 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 New York to Sydney in December from $841

Return flights