There are
1,704 mi
from Boone, IA to Downey, CA
That's the driving distance. It would take 1 day 5 hours to go from Boone, Iowa to Downey, California.
The flight distance (direct flight from Boone, IA to Downey, CA) is 1,428.34 mi.
1,704 mi = 2,743.04 kms