There are
516 mi
from Olathe, KS to Southlake, TX
That's the driving distance. It would take 8 hours 55 mins to go from Olathe, Kansas to Southlake, Texas.
The flight distance (direct flight from Olathe, KS to Southlake, TX) is 430.34 mi.
516 mi = 830.15 kms