There are
1,276 mi
from St Clair Shores, MI to Thornton, CO
That's the driving distance. It would take 22 hours 43 mins to go from St Clair Shores, Michigan to Thornton, Colorado.
The flight distance (direct flight from St Clair Shores, MI to Thornton, CO) is 1,159.10 mi.
1,276 mi = 2,052.81 kms