There are
799 mi
from Longmont, CO to New Ulm, MN
That's the driving distance. It would take 14 hours 33 mins to go from Longmont, Colorado to New Ulm, Minnesota.
The flight distance (direct flight from Longmont, CO to New Ulm, MN) is 614.52 mi.
799 mi = 1,285.62 kms