There are
1,022 mi
from Thornton, CO to Glendale, CA
That's the driving distance. It would take 17 hours 53 mins to go from Thornton, Colorado to Glendale, California.
The flight distance (direct flight from Thornton, CO to Glendale, CA) is 831.61 mi.
1,022 mi = 1.61 kms