In general, when booking your flight to Australia, May is the cheapest month on average.
Most flyers found that booking flight tickets 59 days in advance of their planned departure date is, on average, the best time to get cheap flights to Australia.
In general, booking your departure to Australia for a Tuesday represents the best deal on airfare. Try to avoid a Sunday departure to stay away from the highest prices.
On average you can find the best deals on plane tickets to Australia when looking for flights with afternoon departure times.