There are
510 mi
from Thornton, CO to Cottonwood Heights, UT
That's the driving distance. It would take 8 hours 45 mins to go from Thornton, Colorado to Cottonwood Heights, Utah.
The flight distance (direct flight from Thornton, CO to Cottonwood Heights, UT) is 366.70 mi.
510 mi = 821.55 kms