Miles between Ontario, CA and Thornton, CO

There are
988 mi
from Ontario, CA to Thornton, CO

That's the driving distance. It would take 17 hours 17 mins to go from Ontario, California to Thornton, Colorado.

The flight distance (direct flight from Ontario, CA to Thornton, CO) is 805.56 mi.

988 mi = 1,590.04 kms