Miles between Thornton, CO and Helena, MT

There are
782 mi
from Thornton, CO to Helena, MT

That's the driving distance. It would take 13 hours 6 mins to go from Thornton, Colorado to Helena, Montana.

The flight distance (direct flight from Thornton, CO to Helena, MT) is 584.47 mi.

782 mi = 1,258.76 kms