Taxi fare at midnight in Beijing

From midnight to 05:00 am, the taxi fare from the airport to Wangfujing is almost about 100 RMB.
Actually the shuttle bus line 2 operates until the last flight stops, you can take that shuttle bus to reach Xidan and then take a taxi to reach your hotel. It is much cheaper. It will take you about 40 minutes to 50 minutes to reach the Xidan and about 10-20 minutes from Xidan to your hotel.