There are
1,356 mi
from Rockville, MD to Midlothian, TX
That's the driving distance. It would take 1 day to go from Rockville, Maryland to Midlothian, Texas.
The flight distance (direct flight from Rockville, MD to Midlothian, TX) is 1,198.81 mi.
1,356 mi = 2,182.38 kms