Miles between Great Falls, MT and Longmont, CO

There are
747 mi
from Great Falls, MT to Longmont, CO

That's the driving distance. It would take 12 hours 45 mins to go from Great Falls, Montana to Longmont, Colorado.

The flight distance (direct flight from Great Falls, MT to Longmont, CO) is 592.98 mi.

747 mi = 1,201.92 kms