There are
1,624 mi
from Thornton, CO to Martinsburg, WV
That's the driving distance. It would take 1 day 5 hours to go from Thornton, Colorado to Martinsburg, West Virginia.
The flight distance (direct flight from Thornton, CO to Martinsburg, WV) is 1,431.34 mi.
1,624 mi = 1.61 kms