Miles between Ontario, CA and Longmont, CO

There are
1,006 mi
from Ontario, CA to Longmont, CO

That's the driving distance. It would take 17 hours 43 mins to go from Ontario, California to Longmont, Colorado.

The flight distance (direct flight from Ontario, CA to Longmont, CO) is 808.69 mi.

1,006 mi = 1.61 kms