There are
1,014 mi
from Thornton, CO to Yorba Linda, CA
That's the driving distance. It would take 17 hours 45 mins to go from Thornton, Colorado to Yorba Linda, California.
The flight distance (direct flight from Thornton, CO to Yorba Linda, CA) is 819.98 mi.
1,014 mi = 1.61 kms