There are
2,704 mi
from Gaithersburg, MD to Farmersville, CA
That's the driving distance. It would take 2 days to go from Gaithersburg, Maryland to Farmersville, California.
The flight distance (direct flight from Gaithersburg, MD to Farmersville, CA) is 2,283.69 mi.
2,704 mi = 4,351.77 kms