There are
800 mi
from Clarksville, TN to Seabrook, TX
That's the driving distance. It would take 14 hours 52 mins to go from Clarksville, Tennessee to Seabrook, Texas.
The flight distance (direct flight from Clarksville, TN to Seabrook, TX) is 654.30 mi.
800 mi = 1,287.36 kms