There are
746 mi
from Longmont, CO to Neosho, MO
That's the driving distance. It would take 13 hours 19 mins to go from Longmont, Colorado to Neosho, Missouri.
The flight distance (direct flight from Longmont, CO to Neosho, MO) is 622.89 mi.
746 mi = 1,200.74 kms