Perth Airport is the only airport in Western Australia receiving international flights and also the main one for domestic flights (you can fly onward in the state to Kalgoorlie, Kununurra, Karratha and Broome). London–Perth takes about 18hrs 35mins, currently via Singapore, but with direct flights from the UK starting in March 2018.
Perth is GMT+8. The inevitable jetlag means you’d probably only want to make the journey with kids if you’re spending a good two weeks or more in Australia.
Train services are limited outside of Perth and Mandurah. If you want to hire a car or better still a motorhome and explore Western Australia in any detail, bear in mind the great distances involved and plan your route carefully in advance – many roads are unsealed, petrol stops are few and far between, and there are Aboriginal lands you’ll need permits to cross.
For the adventurous older family, Greyhound runs a coastal coach from Perth North to Broome and then onto Darwin in the Northern Territory.
For perhaps the ultimate family holiday adventure, however, reach Perth via the Indian Pacific railway all the way from Sydney 4352km away, taking three days and three nights, via Kalgoorlie and Adelaide, and passing through the spectacular Blue Mountains en route. It’s possible to break the journey into separate chunks to sightsee en route – a good idea with kids.