Mumbai city bus route no 121 is operated by one of the seven mumbai bus lines: BEST, KDMT, KMT, MBMT, NMMT, TMT, and, VVMT. BEST is the company that primarily operates the public bus transport service in Mumbai and runs multiple number of city buses between J. Mehta Marg and Backbay Bus Depot on daily basis.
This BEST 121 route Mumbai city bus runs about 79 trips every day (one-way) and goes through 38 bus stops during a one way trip.