Sichuan Airlines has some cheap prices on flights to Beijing and Shanghai, China in September/October.
I've tried to get them directly and by going to cheapoair as well, but the only way I can produce them is to first go to kayak, example below, then find the cheapoair deal and click through. Doing it directly on cheapoair seems to cost about $10 more.
https://www.kayak.com.au/flights/SYD-pek/2018-09-04-flexible... - Example search on kayak showing $453 return
These Australian flights are seasonal so not always available.
Destinations: PEK, PVG (Beijing and Shanghai)
Price: from $453 return
For more deals like this, check out our site at http://www.beatthatflight.com.au, looking for the cheapest travel deals for Australians. 100% free to use.