AirHint found the following cheapest return flights from Denver (DEN) to Sydney (SYD) in January 2026 (see full year).

Return flights

22 Jan - 29 Jan	Frontier Airlines
23 Jan - 26 Jan	Frontier Airlines
19 Jan - 02 Feb	Frontier Airlines
19 Jan - 10 Feb	Air Canada
20 Jan - 02 Feb	Frontier Airlines
18 Jan - 29 Jan	Air Canada
06 Jan - 13 Jan	Qantas

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

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 Denver to Sydney in January from $812

Return flights