There are
798 mi
from Marietta, GA to Ottumwa, IA
That's the driving distance. It would take 15 hours 8 mins to go from Marietta, Georgia to Ottumwa, Iowa.
The flight distance (direct flight from Marietta, GA to Ottumwa, IA) is 650.42 mi.
798 mi = 1,284.99 kms