Miles between Thornton, CO and Johnston, IA

There are
665 mi
from Thornton, CO to Johnston, IA

That's the driving distance. It would take 11 hours 31 mins to go from Thornton, Colorado to Johnston, Iowa.

The flight distance (direct flight from Thornton, CO to Johnston, IA) is 602.08 mi.

665 mi = 1,070.24 kms