What is the best way from the JW Marriott at 83 Jian Guo Rd, to the Beijing Capital Airport?

First of all, you need to arrive at the airport at least 2 hours in advance. From your hotel, walk southwest around 800 yards to Dawang Road Metro Station. Take metro line 1 to Guomao Station and line 10 to Sanyuanqiao Station. The duration is around 20 mins. And the ticket fare is CNY 4 per person. After arriving, take the airport express to the terminal building directly. The ticket fare is CNY 25 per person. Hope helpful!