There are
1,064 mi
from Thornton, CO to Mcfarland, CA
That's the driving distance. It would take 18 hours 43 mins to go from Thornton, Colorado to Mcfarland, California.
The flight distance (direct flight from Thornton, CO to Mcfarland, CA) is 829.55 mi.
1,064 mi = 1.61 kms