There are
716 mi
from Garland, TX to Oskaloosa, IA
That's the driving distance. It would take 13 hours 41 mins to go from Garland, Texas to Oskaloosa, Iowa.
The flight distance (direct flight from Garland, TX to Oskaloosa, IA) is 619.32 mi.
716 mi = 1,152.87 kms