Best way to get from Xian Airport to Qin Huang Hotel in Lintong

Well, you are suggested to go to the hotel in the following way.
Upon landing, take a coach at the airport, get off at Lintong Bus Station first. The bus schedules are from 10:00, 11:30, 13:00, 14:30, 16:00, 17:30 and 19:00. The ticket fare is CNY 31.5 per person.
After arriving, take a taxi to get to the destination. The cab fare is around CNY 10.

We don't land until 22:05 and will need to collect luggage. What options will we have this late at night? Is the subway a good option?

First of all, there is no subway that can reach Lintong nowadays.

According to your arrival time, there is no other transportation available except taxi to Lintong. But the thing is fewer drivers would like to go that far in night time.

Or you can use the airport pick up service offered by this website. They have professional drivers. So you can trust them. And the price is reasonable.
The contact information is traveltravelchinaguide.com.