There are
1,643 mi
from Rancho Cucamonga, CA to Johnston, IA
That's the driving distance. It would take 1 day 4 hours to go from Rancho Cucamonga, California to Johnston, Iowa.
The flight distance (direct flight from Rancho Cucamonga, CA to Johnston, IA) is 1,397.68 mi.
1,643 mi = 1.61 kms