There are
2,607 mi
from Rockville, MD to Arcadia, CA
That's the driving distance. It would take 1 day 22 hours to go from Rockville, Maryland to Arcadia, California.
The flight distance (direct flight from Rockville, MD to Arcadia, CA) is 2,273.64 mi.
2,607 mi = 4,195.50 kms