There are
853 mi
from Mckinney, TX to Sevierville, TN
That's the driving distance. It would take 15 hours 15 mins to go from Mckinney, Texas to Sevierville, Tennessee.
The flight distance (direct flight from Mckinney, TX to Sevierville, TN) is 766.26 mi.
853 mi = 1,373.19 kms