There are
1,135 mi
from Thornton, CO to Reedley, CA
That's the driving distance. It would take 20 hours 3 mins to go from Thornton, Colorado to Reedley, California.
The flight distance (direct flight from Thornton, CO to Reedley, CA) is 816.57 mi.
1,135 mi = 1.61 kms