Miles between Thornton, CO and Piedmont, CA

There are
1,240 mi
from Thornton, CO to Piedmont, CA

That's the driving distance. It would take 21 hours 15 mins to go from Thornton, Colorado to Piedmont, California.

The flight distance (direct flight from Thornton, CO to Piedmont, CA) is 937.95 mi.

1,240 mi = 1.61 kms