There are
1,444 mi
from Thornton, CO to Clarksburg, WV
That's the driving distance. It would take 1 day 2 hours to go from Thornton, Colorado to Clarksburg, West Virginia.
The flight distance (direct flight from Thornton, CO to Clarksburg, WV) is 1,308.06 mi.
1,444 mi = 1.61 kms