AirHint found the following cheapest return flights from Denver (DEN) to Sydney (SYD) in December 2025 (see full year).
Return flights
| 28 Dec - 09 Jan | Delta | ||
| 22 Dec - 29 Dec | Air Canada | ||
| 15 Dec - 22 Dec | Frontier Airlines | ||
| 17 Dec - 07 Jan | Frontier Airlines | ||
| 26 Dec - 03 Jan | Air Canada | ||
| 22 Dec - 02 Jan | Frontier Airlines | ||
| 22 Dec - 09 Jan | Delta |
Also check the deals for one-way flights from Denver to Sydney in December.
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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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