There are
1,823 mi
from Downey, CA to Wentzville, MO
That's the driving distance. It would take 1 day 7 hours to go from Downey, California to Wentzville, Missouri.
The flight distance (direct flight from Downey, CA to Wentzville, MO) is 1,548.30 mi.
1,823 mi = 1.61 kms