There are
1,127 mi
from Thornton, CO to Kalamazoo, MI
That's the driving distance. It would take 20 hours 2 mins to go from Thornton, Colorado to Kalamazoo, Michigan.
The flight distance (direct flight from Thornton, CO to Kalamazoo, MI) is 1,021.09 mi.
1,127 mi = 1.61 kms