There are
255 mi
from Rialto, CA to Paso Robles, CA
That's the driving distance. It would take 4 hours 56 mins to go from Rialto, California to Paso Robles, California.
The flight distance (direct flight from Rialto, CA to Paso Robles, CA) is 215.52 mi.
255 mi = 411.15 kms