 The Delhi Metro is being built in phases . Phase I completed 58 stations and 65 @.@ 0 km ( 40 @.@ 4 mi ) of route length , of which 13 @.@ 0 km ( 8 @.@ 1 mi ) is underground and 52 @.@ 1 km ( 32 @.@ 4 mi ) surface or elevated . The inauguration of the Dwarka – Barakhamba Road corridor of the Blue Line marked the completion of Phase I on October 2006 . Phase II of the network comprises 124 @.@ 6 km ( 77 @.@ 4 mi ) of route length and 85 stations , and is fully completed , with the first section opened in June 2008 and the last line opened in August 2011 . Phase III ( 140 km , 69 stations ) and Phase IV ( 106 km , 51 stations ) are planned to be completed by 2016 and 2020 respectively , with the network spanning 436 km ( 271 mi ) by then . 
