There are
1,323 mi
from Rockville, MD to Forney, TX
That's the driving distance. It would take 23 hours 50 mins to go from Rockville, Maryland to Forney, Texas.
The flight distance (direct flight from Rockville, MD to Forney, TX) is 1,163.35 mi.
1,323 mi = 2,128.59 kms