The metro line extends from Matinkylä in Espoo to the eastern parts of Helsinki. The metro has 25 stations.
From Monday to Saturday there are departures from 5.30 am to 11.30 pm, and on Sundays from 6.30 am to 11.30 pm.
The metro runs on two lines: Matinkylä–Vuosaari and Tapiola–Mellunmäki. During peak hours, the interval of trains on the shared part of the lines (Tapiola–Itäkeskus) is 2.5 minutes. The travelling time between Matinkylä and Vuosaari is 39 minutes, and between Tapiola and Mellunmäki, 34 minutes.
The metro line was extended from Ruoholahti to Matinkylä in November 2017. The extension project added 8 new stations to the line.
Metro transport operations are planned and ordered by Helsinki Region Transport (HSL). Helsinki City Transport HKL is responsible for the operation of the metro and the maintenance of the metro units.