Bus from Bell Tower to Airport, Xian

The airport shuttle bus is too late for you. You should take a taxi or hail a didi car online to the airport，taking around CNY150.

Or take a taxi or didi to North Railway Station and take the first metro line 14 departing at 06:00 there to the airport. It needs about 40 minutes from the North Railway Station to airport by metro. This is troublesome but saves some money.

Hi Rita, thanks for your answer.
Finally I took a taxi to the Xian Hotel (5 minutes away from the Bell Tower), and there’s a shuttle bus that goes all night every 30’. It cost CNY 25. I took de 5.30am bus.
You don’t need to be host of the hotel to use it, it’s for everyone.
Hope this info helps other people :)

Hi Seb, thanks for sharing the info. It's very much appreciated:)