As we mentioned earlier on the blog, Australia is on sale from a number of US cities and these deals are the best we've seen from some of the smaller market cities.
Searching on Orbitz, I found seats departing LAS on Tuesday, November 27, returning from PER on Thursday, December 6, 2018.
This great price can be found on a few different third party sites for departures from the USA on Mondays, Tuesdays, Wednesdays, and Thursdays, through November. You may return through the end of the booking schedule in June 2019, excluding holiday travel.
There are excellent fares from Las Vegas (LAS) to cities all over Australia and elsewhere around the world.
Need a room in Perth? Here's what's available for the above dates on Hotelwatchdog.