Xidan night bus: from 24:00 to the end of domestic flights, the route is Sanyuanqiao--Yuyang Hotel--Dongzhimen--Dongsishitiao Bridge--Chaoyangmen--Yabao Road--Beijing Station--Xidan (Civil Aviation
Business Building) The above information comes from the official website of Capital Airport. You can take the airport bus to the terminal Xidan, the fare is 16.