There are
2,795 mi
from Gaithersburg, MD to San Leandro, CA
That's the driving distance. It would take 2 days to go from Gaithersburg, Maryland to San Leandro, California.
The flight distance (direct flight from Gaithersburg, MD to San Leandro, CA) is 2,409.89 mi.
2,795 mi = 4,497.85 kms