Phase 1B involves building an 11.2km branch which would diverge from the initial north-south line at Jawaharlal Nehru Stadium, running east through Kaloor, Chembumukku and Kunnumpuram before terminating at Infopark in Kakkanad. The line will have 11 stations and daily ridership is expected to reach 126,000 by 2021 and 198,000 by 2031.

The initial 25.6km line from Aluva to Pettnaline is due to open next June.