There are
2,080 mi
from Downey, CA to Zionsville, IN
That's the driving distance. It would take 1 day 12 hours to go from Downey, California to Zionsville, Indiana.
The flight distance (direct flight from Downey, CA to Zionsville, IN) is 1,798 mi.
2,080 mi = 3.22 kms