There are
2,612 mi
from Rockville, MD to Fullerton, CA
That's the driving distance. It would take 1 day 22 hours to go from Rockville, Maryland to Fullerton, California.
The flight distance (direct flight from Rockville, MD to Fullerton, CA) is 2,274.40 mi.
2,612 mi = 4,204.19 kms