AirHint found the following cheapest return flights from Salt Lake City (SLC) to Sydney (SYD) in December 2025 (see full year).
Return flights
| 04 Dec - 17 Dec | United | ||
| 12 Dec - 06 Jan | Alaska Airlines | ||
| 13 Dec - 06 Jan | Frontier Airlines | ||
| 27 Dec - 04 Jan | Qantas |
Also check the deals for one-way flights from Salt Lake City to Sydney in December.
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