Miles between Longmont, CO and Williston, ND

There are
655 mi
from Longmont, CO to Williston, ND

That's the driving distance. It would take 12 hours 27 mins to go from Longmont, Colorado to Williston, North Dakota.

The flight distance (direct flight from Longmont, CO to Williston, ND) is 556.21 mi.

655 mi = 1,054.86 kms