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

Return flights

04 Dec - 11 Dec	Sun Country Airlines
09 Dec - 27 Dec	Austrian Airlines
04 Dec - 09 Dec	Air Canada
09 Dec - 15 Dec	jetBlue
01 Dec - 16 Dec	ANA
08 Dec - 18 Dec	Qantas
25 Dec - 13 Jan	Air Canada
24 Dec - 13 Jan	Air Canada
16 Dec - 13 Jan	Qantas
12 Dec - 27 Dec	Air Canada
06 Dec - 31 Dec	Alaska Airlines
15 Dec - 01 Jan	Qantas
10 Dec - 19 Dec	Qantas
31 Dec - 18 Jan	Delta
13 Dec - 29 Dec	Qantas
24 Dec - 09 Jan	jetBlue
14 Dec - 08 Jan	Sun Country Airlines
25 Dec - 08 Jan	Air Canada
15 Dec - 15 Jan	Air Canada
18 Dec - 11 Jan	Norse Atlantic Airways

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 $1127

Return flights