The 14.2km 12-station line will connect Bucharest North Station with Henri Coandă International Airport, which is located in the district of Otopeni.

Line 6 services will share Line 4 tracks between North Station and 1 Mai, where they will diverge onto a new branch to the airport.

European funding will come from the Large Infrastructure Operational Programme. The final amount has yet to be determined and is subject to further discussion between the EC, the Romanian government and Japan International Cooperation Agency (Jica), which is also co-financing the €1.39bn project with a €356m loan.