There are
1,888 mi
from Saginaw, MI to Post Falls, ID
That's the driving distance. It would take 1 day 10 hours to go from Saginaw, Michigan to Post Falls, Idaho.
The flight distance (direct flight from Saginaw, MI to Post Falls, ID) is 1,610.89 mi.
1,888 mi = 3,037.82 kms