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

Return flights

10 Dec - 17 Dec	Frontier Airlines
10 Dec - 19 Dec	Qantas
29 Dec - 15 Jan	Frontier Airlines
11 Dec - 17 Dec	Qantas
31 Dec - 18 Jan	Qantas
31 Dec - 10 Jan	Qantas
10 Dec - 15 Dec	Qantas
08 Dec - 12 Dec	Qantas
11 Dec - 10 Jan	Qantas
29 Dec - 10 Jan	Qantas
29 Dec - 26 Jan	Qantas
29 Dec - 12 Jan	Qantas
29 Dec - 20 Jan	Aeromexico
10 Dec - 31 Dec	Frontier Airlines
27 Dec - 16 Jan	Qantas
30 Dec - 13 Jan	Delta
11 Dec - 23 Dec	Frontier Airlines
23 Dec - 26 Dec	Frontier Airlines
12 Dec - 21 Dec	Xiamen Airlines
14 Dec - 27 Dec	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 1033€

Return flights