The completion of the extension takes the total length of Line 1 to 34km with 26 stations.
The existing fleet of five AnsaldoBreda MB-300 five-car trains is being supplemented by 19 five-car Alstom Metrópolis 9000 sets, providing capacity a six-minute interval service at peak times.
The line is operated by concessionaire A & M Ferrovías and a contactless smartcard system has been introduced, although this has yet to be integrated with the city's bus network.
Preliminary construction is expected to begin next month on the 35km Line 2 from Ate to Callao and the city's airport. The project is being implemented as a 35-year public-private partnership.