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

Return flights

04 Dec - 13 Dec	Fiji Airways
04 Dec - 08 Dec	Spirit Airlines
01 Dec - 10 Dec	Delta
03 Dec - 10 Dec	Delta
12 Dec - 16 Jan	Air Canada
11 Dec - 18 Dec	Delta
14 Dec - 11 Jan	Spirit Airlines
01 Dec - 13 Jan	Qantas
04 Dec - 15 Dec	ANA
08 Dec - 12 Jan	Spirit Airlines
30 Dec - 12 Jan	Delta
12 Dec - 31 Dec	Spirit Airlines
11 Dec - 10 Jan	Spirit Airlines
30 Dec - 06 Jan	Delta
30 Dec - 13 Jan	Fiji Airways
07 Dec - 14 Dec	ANA
30 Dec - 10 Jan	Delta
31 Dec - 10 Jan	Delta
04 Dec - 07 Dec	Air Canada
10 Dec - 19 Dec	United

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 $1285

Return flights