There are
2,819 mi
from Gaithersburg, MD to Menlo Park, CA
That's the driving distance. It would take 2 days 1 hour to go from Gaithersburg, Maryland to Menlo Park, California.
The flight distance (direct flight from Gaithersburg, MD to Menlo Park, CA) is 2,416.66 mi.
2,819 mi = 4,535.96 kms