There are
835 mi
from Ottumwa, IA to Stephenville, TX
That's the driving distance. It would take 15 hours 15 mins to go from Ottumwa, Iowa to Stephenville, Texas.
The flight distance (direct flight from Ottumwa, IA to Stephenville, TX) is 687 mi.
835 mi = 1,343.04 kms