There are
899 mi
from Lewisville, TX to Seymour, IN
That's the driving distance. It would take 16 hours 7 mins to go from Lewisville, Texas to Seymour, Indiana.
The flight distance (direct flight from Lewisville, TX to Seymour, IN) is 742.18 mi.
899 mi = 1,446.01 kms