There are
776 mi
from Flower Mound, TX to Marshalltown, IA
That's the driving distance. It would take 13 hours 52 mins to go from Flower Mound, Texas to Marshalltown, Iowa.
The flight distance (direct flight from Flower Mound, TX to Marshalltown, IA) is 664.88 mi.
776 mi = 1,249.07 kms