There are
2,631 mi
from Huntington Beach, CA to Gaithersburg, MD
That's the driving distance. It would take 1 day 23 hours to go from Huntington Beach, California to Gaithersburg, Maryland.
The flight distance (direct flight from Huntington Beach, CA to Gaithersburg, MD) is 2,280.78 mi.
2,631 mi = 3.22 kms