There are
1,338 mi
from Gaithersburg, MD to The Colony, TX
That's the driving distance. It would take 1 day to go from Gaithersburg, Maryland to The Colony, Texas.
The flight distance (direct flight from Gaithersburg, MD to The Colony, TX) is 1,172.65 mi.
1,338 mi = 2,153.84 kms