There are
2,745 mi
from Rockville, MD to Paso Robles, CA
That's the driving distance. It would take 2 days 1 hour to go from Rockville, Maryland to Paso Robles, California.
The flight distance (direct flight from Rockville, MD to Paso Robles, CA) is 2,380.30 mi.
2,745 mi = 4,417.14 kms