There are
854 mi
from Gaithersburg, MD to Sanford, FL
That's the driving distance. It would take 15 hours 49 mins to go from Gaithersburg, Maryland to Sanford, Florida.
The flight distance (direct flight from Gaithersburg, MD to Sanford, FL) is 754.64 mi.
854 mi = 1,374.60 kms