There are
858 mi
from Lewisville, TX to Rantoul, IL
That's the driving distance. It would take 15 hours 8 mins to go from Lewisville, Texas to Rantoul, Illinois.
The flight distance (direct flight from Lewisville, TX to Rantoul, IL) is 700.44 mi.
858 mi = 1,380.31 kms