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

Return flights

01 Dec - 08 Dec	United
05 Dec - 21 Dec	United
10 Dec - 19 Dec	United
31 Dec - 14 Jan	Air Canada
12 Dec - 26 Dec	United
21 Dec - 13 Jan	Air Canada
12 Dec - 06 Jan	United
16 Dec - 31 Dec	Air Canada
18 Dec - 13 Jan	Air Canada
24 Dec - 06 Jan	United
11 Dec - 02 Jan	United
29 Dec - 05 Jan	Air Canada
21 Dec - 12 Jan	Air Canada
24 Dec - 10 Jan	United
26 Dec - 07 Jan	United
21 Dec - 31 Dec	Air Canada
17 Dec - 28 Dec	ANA
16 Dec - 28 Dec	United
19 Dec - 31 Dec	Air Canada
12 Dec - 14 Dec	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 $989

Return flights