Take Metro Line 4 at Beijing Library Station and take 3 stops to Haidian Huang Zhuang Station, which takes about 6 minutes by car. Then transfer to the subway 10 line, take 1 1 station and get off at Sanyuan Bridge (about 25-30 minutes), then transfer to the airport express line at Sanyuan Bridge, which takes about 20 minutes to reach the Capital Airport T3 and 35 minutes to reach t 2. If all goes well, it will take about 1- 1.5 hours to arrive at the Capital Airport.