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Given the geographical position, Retezat massif can be accessed from two directions: Haţeg and Jiu Valley.
To Haţeg you can drive from Deva (50 km) on National Road 66 (DN 66 on route Deva-Simeria-Hateg),
or coming from Caransebeş, on DN 68 (Caransebeş-Haţeg).
You can arrive in Jiu Valley coming from Deva on DN 66 (on route Deva-Simeria-Haţeg-Pui-Petroşani), or you can come from Tg. Jiu on the same DN 66 (on route Filiaşi-Tg.Jiu-Petroşani).
From Haţeg and Petroşani there are multiple ways to enter Retezat massif.
Haţeg Valley access routes
Haţeg-Râu de Mori-Gura Apei-Poiana Pelegii (63km)
Haţeg-Râu de Mori-Râusor route (33km)
Haţeg (to Petroşani direction)-Ohaba de sub Piatră-Cârnic (28km).
Jiu Valley access routes
You can arrive on Jiu Valley coming from Deva, on DN 66 (Deva-Simeria-Haţeg-Pui-Petroşani route - 100km), or coming from Tg. Jiu, on same DN 66 (Filiaşi-Tg.Jiu-Petroşani route).
There are a couple of routes from Petroşani to park entrances:
Petroşani-Lupeni-Uricani-Câmpu lui Neag-Cheile Butii (40km)
Petroşani-Lupeni-Uricani-Câmpu lui Neag-Câmpusel (60km)