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

Return flights

11 Dec - 25 Dec	Air Canada
30 Dec - 15 Jan	Air Canada
10 Dec - 22 Dec	Air Canada
10 Dec - 14 Dec	Air Canada
08 Dec - 15 Dec	United
07 Dec - 14 Dec	United
29 Dec - 16 Jan	Air Canada
07 Dec - 15 Dec	Air Canada
31 Dec - 12 Jan	United
09 Dec - 20 Dec	United
04 Dec - 09 Dec	United
12 Dec - 15 Dec	Air Canada
11 Dec - 15 Dec	Air Canada
30 Dec - 13 Jan	United
30 Dec - 11 Jan	United
29 Dec - 20 Jan	Delta
04 Dec - 08 Jan	United
29 Dec - 13 Jan	Frontier Airlines
28 Dec - 13 Jan	Qantas
07 Dec - 09 Jan	Delta

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 819€

Return flights