Cheapest return flights from Denver to Sydney in September from 659€

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

Return flights

09 Sep - 23 Sep Alaska Airlines
19 Sep - 15 Oct Hawaiian Airlines
06 Sep - 21 Sep Hawaiian Airlines
10 Sep - 19 Sep Frontier Airlines
03 Sep - 23 Sep Frontier Airlines
21 Sep - 25 Sep Air Canada
03 Sep - 22 Sep Air Canada
03 Sep - 24 Sep Air Canada
17 Sep - 24 Sep Air Canada

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

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.

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