There are
625 mi
from Longmont, CO to Lenexa, KS
That's the driving distance. It would take 10 hours 41 mins to go from Longmont, Colorado to Lenexa, Kansas.
The flight distance (direct flight from Longmont, CO to Lenexa, KS) is 558.30 mi.
625 mi = 1,005.68 kms