There are
322 mi
from Gaithersburg, MD to Sanford, NC
That's the driving distance. It would take 6 hours 12 mins to go from Gaithersburg, Maryland to Sanford, North Carolina.
The flight distance (direct flight from Gaithersburg, MD to Sanford, NC) is 275.47 mi.
322 mi = 518.18 kms