There are
1,805 mi
from Arcadia, CA to St Peters, MO
That's the driving distance. It would take 1 day 7 hours to go from Arcadia, California to St Peters, Missouri.
The flight distance (direct flight from Arcadia, CA to St Peters, MO) is 1,551.43 mi.
1,805 mi = 2,905.18 kms