There are
496 mi
from Longmont, CO to Cottonwood Heights, UT
That's the driving distance. It would take 8 hours 31 mins to go from Longmont, Colorado to Cottonwood Heights, Utah.
The flight distance (direct flight from Longmont, CO to Cottonwood Heights, UT) is 356.72 mi.
496 mi = 798.65 kms