In general, when booking your flight to Australia, February is the cheapest month on average.
Most flyers found that booking flight tickets 58 days in advance of their planned departure date is, on average, the best time to get cheap flights to Australia.
From most locations, the cheapest day to fly to Australia is Monday. Most users found that departing on a Friday was most expensive.
On average you can find the best deals on plane tickets to Australia when looking for flights with afternoon departure times.