There are
908 mi
from Lewisville, TX to Sycamore, IL
That's the driving distance. It would take 16 hours 55 mins to go from Lewisville, Texas to Sycamore, Illinois.
The flight distance (direct flight from Lewisville, TX to Sycamore, IL) is 766.64 mi.
908 mi = 1,462.04 kms