There are
911 mi
from Longmont, CO to Mendota Heights, MN
That's the driving distance. It would take 16 hours 7 mins to go from Longmont, Colorado to Mendota Heights, Minnesota.
The flight distance (direct flight from Longmont, CO to Mendota Heights, MN) is 689.89 mi.
911 mi = 1,465.43 kms