There are
961 mi
from Thornton, CO to Yucca Valley, CA
That's the driving distance. It would take 17 hours 30 mins to go from Thornton, Colorado to Yucca Valley, California.
The flight distance (direct flight from Thornton, CO to Yucca Valley, CA) is 746.08 mi.
961 mi = 1,545.95 kms