The line originally opened between Plaza Elíptica and Pan Bendito on 16 November 1998.

In 2006 the line was extended from Pan Bendito to La Peseta with two intermediate stations.

The final form is projected to become a large 'Diagonal' which would connect 11 of the 12 lines of the metro.

From the northeast, it will lead through the city centre, connecting all the lines at the East via a semicircular trajectory, then reaching the Barajas Airport and the new Hospital Isabel Zendal (built during the COVID-19 pandemic) and finally ending in the Valdebebas new urban development.

[5] Line 11 uses four-car trains of CAF class 8000 large rolling stock since the opening of the La Fortuna extension.