Kununurra is a very long way from just about everywhere. If you take the short route from Perth, via the Great Northern Highway, it is 3184 km and if you take the long route it is 3336 km. It is also 1057 km from Broome (the nearest major town in Western Australia) and 1057 km from Darwin. And if you want to drive from Sydney it is about 4300 km.
From the web at; http://www.walkabout.com.au/locations/WAKununurra.shtml