There are
2,817 mi
from Rockville, MD to Ukiah, CA
That's the driving distance. It would take 2 days 2 hours to go from Rockville, Maryland to Ukiah, California.
The flight distance (direct flight from Rockville, MD to Ukiah, CA) is 2,441.44 mi.
2,817 mi = 4,533.98 kms