There are
1,293 mi
from Longmont, CO to Crossville, TN
That's the driving distance. It would take 23 hours 1 min to go from Longmont, Colorado to Crossville, Tennessee.
The flight distance (direct flight from Longmont, CO to Crossville, TN) is 1,127.62 mi.
1,293 mi = 1.61 kms