There are
2,600 mi
from Rockville, MD to Covina, CA
That's the driving distance. It would take 1 day 22 hours to go from Rockville, Maryland to Covina, California.
The flight distance (direct flight from Rockville, MD to Covina, CA) is 2,267.10 mi.
2,600 mi = 4,183.51 kms