There are
873 mi
from Flower Mound, TX to Rantoul, IL
That's the driving distance. It would take 15 hours 21 mins to go from Flower Mound, Texas to Rantoul, Illinois.
The flight distance (direct flight from Flower Mound, TX to Rantoul, IL) is 706.04 mi.
873 mi = 1,404.74 kms