There are
2,773 mi
from Rockville, MD to Mendota, CA
That's the driving distance. It would take 2 days 1 hour to go from Rockville, Maryland to Mendota, California.
The flight distance (direct flight from Rockville, MD to Mendota, CA) is 2,339.54 mi.
2,773 mi = 4,462.52 kms