There are
862 mi
from Longview, TX to Sycamore, IL
That's the driving distance. It would take 15 hours 53 mins to go from Longview, Texas to Sycamore, Illinois.
The flight distance (direct flight from Longview, TX to Sycamore, IL) is 734.79 mi.
862 mi = 1,387.89 kms