In general when looking for the cheapest flight to Australia, try to book your flight during the month of August for the best deal.
From most locations, booking your flights to Australia around 59 days prior to your departure date finds the best deals.
Most of our users find that booking their departure to Australia on a Thursday is the cheapest. Conversely, departing on a Sunday seems to be the most expensive.
On average you can find the best deals on plane tickets to Australia when looking for flights with morning departure times.