Cheapest return flights from Denver to Sydney in December from $1525

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 Qantas
26 Dec - 29 Dec Qantas
28 Dec - 10 Jan Frontier Airlines

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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