There are
2,576 mi
from Gaithersburg, MD to San Jacinto, CA
That's the driving distance. It would take 1 day 22 hours to go from Gaithersburg, Maryland to San Jacinto, California.
The flight distance (direct flight from Gaithersburg, MD to San Jacinto, CA) is 2,222.02 mi.
2,576 mi = 4,144.92 kms