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

Return flights

29 Dec - 18 Jan	Air Canada
31 Dec - 18 Jan	Air Canada
25 Dec - 27 Dec	Qantas
27 Dec - 16 Jan	Spirit Airlines
29 Dec - 20 Jan	Qantas
30 Dec - 13 Jan	Frontier Airlines
26 Dec - 06 Jan	American Airlines
29 Dec - 05 Jan	Frontier Airlines
26 Dec - 31 Dec	Frontier Airlines
28 Dec - 09 Jan	Sun Country Airlines
26 Dec - 07 Jan	Frontier Airlines
31 Dec - 08 Jan	Qantas

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 1037€

Return flights