To save up to 16% on this flight, we recommend booking at least 46 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Waterloo to Sydney from $972 1-2 weeks out and tickets from $1089 for flights departing within the next 72 hours.
Due to multiple factors, expect to potentially pay more when booking in December. For low rates, March can be a great choice for travel to Sydney. Flights to Sydney from Waterloo in March are about $1040 on average during March, but can be found for as low as $734.