There are
1,230 mi
from St George, UT to Leavenworth, KS
That's the driving distance. It would take 21 hours 5 mins to go from St George, Utah to Leavenworth, Kansas.
The flight distance (direct flight from St George, UT to Leavenworth, KS) is 1,022.53 mi.
1,230 mi = 1.61 kms