expired Sydney Return to Aspen or Denver, Colorado $846, Washington DC or Houston, Texas or Chicago $860 via Virgin/Delta & Qantas
Virgin Australia along with their codeshare partner Delta are offering cheap flights to the US. Qantas is also matching the prices on some of the routes. Nothing beats NY especially at $845 however DC and Chicago are great destinations. Was in Chicago last summer and was great. Just don't go in winter.
Fares include bags, meals, seats. A couple of layovers on the way. Dates range from January to August 2018.
Find the flights in Google Flights then use Skyscanner, Momondo, IWTF or whatever to book your flights. Skyscanner isn't picking up all of the cheap flights. If that's the case use one of the other booking sites.
Also, if you are OK to fly with United, they are offering flights to Miami for $950