Line U2 will be split to form two lines. The section between Karlsplatz and Rathaus will become part of Line U5, which will be extended north to University of Vienna campus at Altes AKH. The remaining section of Line U2 from Seestadt will be extended south from Rathaus to an interchange with the S-Bahn network at Matzleinsdorfer Platz in the district of Favoriten. Construction will start in 2018 and the project will be completed in 2023.

However, in order to free up funds for the construction of the new sections, the council has decided to defer the planned extension of Line U2 from Karlsplatz to Gudrunstrasse. At a later stage Line U5 could be extended from Altes AKH to Elterleinplatz and Line U2 from Matzleinsdorferplatz to Wienerberg.

By 2018 Line O will be extended from Praterstern to the Nordbahnhof area, where a major urban regeneration project is planned and Line D will be extended from Main Station to Gudrunstrasse by 2019.

There are also plans to extend Line 67 from Reumannplatz to Siedlung Süd-Ost as the line will be truncated once the metro Line U1 extension to Oberlaa opens. Further tram plans include a new Line 15 from Meidling to Altes Landgut and an extension of Line 25 from Aspern to Aspern North. No timescales have been given for the implementation of these projects.