There are
2,636 mi
from Huntington Beach, CA to Rockville, MD
That's the driving distance. It would take 1 day 23 hours to go from Huntington Beach, California to Rockville, Maryland.
The flight distance (direct flight from Huntington Beach, CA to Rockville, MD) is 2,283.63 mi.
2,636 mi = 3.22 kms