How much is the airfare from Chengdu to Xian? and how many hours?

It is hard to tell you the exact price for flight from Chengdu to Xian, because get can get a large discount if you book the tickets in advance.
As far as I know, many airline companies have the flights such as Eastern Airlines, Sichuan Airlines and Southern Airlines. I think you can find the price information on their official websites.
The flight takes about 70 minutes on the way.