AirHint found the following cheapest return flights from Salt Lake City (SLC) to Sydney (SYD) in December 2025 (see full year).

Return flights

12 Dec - 06 Jan	Alaska Airlines
10 Dec - 17 Dec	Delta
13 Dec - 06 Jan	Hawaiian Airlines
24 Dec - 02 Jan	Frontier Airlines
25 Dec - 02 Jan	Hawaiian Airlines
19 Dec - 30 Dec	Alaska Airlines
23 Dec - 02 Jan	Qantas
21 Dec - 02 Jan	Frontier Airlines
22 Dec - 02 Jan	Frontier Airlines
18 Dec - 05 Jan	Alaska Airlines
20 Dec - 02 Jan	Frontier Airlines
19 Dec - 02 Jan	Alaska Airlines

Also check the deals for one-way flights from Salt Lake City 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 Salt Lake City to Sydney in December from $1420

Return flights