There are
733 mi
from Denton, TX to Ottumwa, IA
That's the driving distance. It would take 13 hours 18 mins to go from Denton, Texas to Ottumwa, Iowa.
The flight distance (direct flight from Denton, TX to Ottumwa, IA) is 598.33 mi.
733 mi = 1,180.40 kms