There are
680 mi
from Cheyenne, WY to Marshalltown, IA
That's the driving distance. It would take 11 hours 52 mins to go from Cheyenne, Wyoming to Marshalltown, Iowa.
The flight distance (direct flight from Cheyenne, WY to Marshalltown, IA) is 618.21 mi.
680 mi = 1,094.71 kms