There are
607 mi
from Chattanooga, TN to Gaithersburg, MD
That's the driving distance. It would take 11 hours 13 mins to go from Chattanooga, Tennessee to Gaithersburg, Maryland.
The flight distance (direct flight from Chattanooga, TN to Gaithersburg, MD) is 528.67 mi.
607 mi = 976.89 kms