There are
1,777 mi
from Waterloo, IA to Monrovia, CA
That's the driving distance. It would take 1 day 7 hours to go from Waterloo, Iowa to Monrovia, California.
The flight distance (direct flight from Waterloo, IA to Monrovia, CA) is 1,498.35 mi.
1,777 mi = 2,860.01 kms