Cheapest return flights from Denver to Sydney in December from $1707

Best time to book flights for Denver (DEN) to Sydney (SYD) flights at AirHint

AirHint found the following cheapest return flights from Denver (DEN) to Sydney (SYD) in December 2025 (see full year).

Return flights

23 Dec - 01 Jan Fiji Airways
20 Dec - 29 Dec United
17 Dec - 04 Jan United

Also check the deals for one-way flights from Denver to Sydney in December.

Skyscanner

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.

Book a cheap hotel in Sydney

Cheap car rent in Sydney