There are
941 mi
from Naperville, IL to Seagoville, TX
That's the driving distance. It would take 17 hours 7 mins to go from Naperville, Illinois to Seagoville, Texas.
The flight distance (direct flight from Naperville, IL to Seagoville, TX) is 781.77 mi.
941 mi = 1,515.03 kms