There are
1,110 mi
from Thornton, CO to Noblesville, IN
That's the driving distance. It would take 19 hours 57 mins to go from Thornton, Colorado to Noblesville, Indiana.
The flight distance (direct flight from Thornton, CO to Noblesville, IN) is 1,002.51 mi.
1,110 mi = 1.61 kms