There are
1,740 mi
from St George, UT to Clarksville, IN
That's the driving distance. It would take 1 day 6 hours to go from St George, Utah to Clarksville, Indiana.
The flight distance (direct flight from St George, UT to Clarksville, IN) is 1,517.38 mi.
1,740 mi = 1.61 kms