Currently, the most affordable months to travel to Sydney are January/2020 and March/2020. You will pay the most in December/2019.
Qantas Airways, Virgin Australia, Delta, United and American Airlines fly non-stop between the United States of America and Sydney.
The cheapest airline to fly to Sydney from the United States of America is Fiji Airways.
Qatar Airways is the best airline to fly to Sydney from the United States of America. Qantas Airways is the best for direct flights.