2nd Airport Expressway

2nd Airport Expressway
Route information
Length	11.5 km (7.1 mi)
Existed	2008–present
Major junctions
From	Yaojiayuan Road in Chaoyang District, Beijing
To	Terminal 3 at Beijing Capital International Airport
Location
Country	China
Province	Beijing
Highway system
Transport in China
← Beijing S50 → Beijing S66

The 2nd Airport Expressway (Chinese: 首都机场第二高速公路), officially numbered S51, is a toll expressway that connects eastern Beijing with Terminal 3 of Beijing Capital International Airport. It opened on February 29, 2008, just prior to the 2008 Beijing Olympics. It runs for 11.5 km from Yaojiayuan Road in Chaoyang District to Terminal 3. It was built to serve the new Terminal 3, and to reduce pressure of Airport Expressway, which has been heavily congested.