I will be landing Xian Xianyang Airport on Sep 8 at 00:40.

Upon landing, you are suggested to take Xishaomen Line and get off at Xishaomen Business Hotel first. This bus line will operate at that time. Don't worry. It takes around an hour on the way with the ticket fare of CNY25 per person. After arriving, take a taxi to the destination.

Thanks, Caden. But my understanding is that no shuttle buses or trains run at 00:40 from Xi'an airport. They all stop around 23:00. Is the train that you are suggesting still runs and how frequently? Thanks.

There is no train operates at that time. According to the information on the official website, Xishaomen shuttle bus line will operate until the flight arrival. Thus you can catch it.

Thanks for the clarification. About how much should I expect to pay for taxi from Xishaomen Airport Hotel to Chenggong International Hotel and would a taxi be easily available at that hour at the airport hotel. Thanks again!

The cab fare is around CNY20 at that time. In addition, it will be ok for you to find a taxi. Don't worry.