There are
992 mi
from Mt Prospect, IL to Seagoville, TX
That's the driving distance. It would take 17 hours 37 mins to go from Mt Prospect, Illinois to Seagoville, Texas.
The flight distance (direct flight from Mt Prospect, IL to Seagoville, TX) is 803.65 mi.
992 mi = 1,595.82 kms