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

Return flights

02 Dec - 12 Dec	Air Canada
30 Dec - 13 Jan	Air Canada
11 Dec - 16 Dec	Air Canada
06 Dec - 13 Dec	Air Canada
31 Dec - 12 Jan	United
10 Dec - 19 Dec	Frontier Airlines
02 Dec - 09 Dec	Air Canada
12 Dec - 26 Dec	Air Canada
27 Dec - 19 Jan	Air Canada
01 Dec - 11 Dec	Delta
06 Dec - 12 Dec	Frontier Airlines
01 Dec - 14 Dec	Spirit Airlines
12 Dec - 21 Dec	Air Canada
30 Dec - 10 Jan	Air Canada
06 Dec - 06 Jan	Frontier Airlines
31 Dec - 10 Jan	United
11 Dec - 11 Jan	Delta
29 Dec - 10 Jan	Air Canada
12 Dec - 12 Jan	Air Canada
28 Dec - 11 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 $983

Return flights