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

Return flights

01 Dec - 21 Dec	United
13 Dec - 06 Jan	Hawaiian Airlines
20 Dec - 09 Jan	Frontier Airlines
11 Dec - 02 Jan	Frontier Airlines
12 Dec - 06 Jan	Alaska Airlines
24 Dec - 02 Jan	Frontier Airlines
12 Dec - 02 Jan	United
25 Dec - 02 Jan	Hawaiian Airlines
15 Dec - 04 Jan	Korean Air
23 Dec - 02 Jan	Frontier Airlines
21 Dec - 02 Jan	Frontier Airlines
19 Dec - 30 Dec	Frontier 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 740€

Return flights