What is the air air from Xian to Chengdu one way & how long is the travel time. also air for return

Sichuan Airline, Hainan Airline, Eastern Airline and Air China have this flight, which will take you about an hour and a half.
As for the Wifi, it is hard to tell you whether you need to get from the staff. Different hotels have different regulations. According to my expensive, you had better ask the hotel staff, and then will surely tell you how to connect to the Wifi there.