There are
666 mi
from Clarksville, TN to Seagoville, TX
That's the driving distance. It would take 12 hours 2 mins to go from Clarksville, Tennessee to Seagoville, Texas.
The flight distance (direct flight from Clarksville, TN to Seagoville, TX) is 586.87 mi.
666 mi = 1,072.29 kms