There are
1,806 mi
from St Peters, MO to Arcadia, CA
That's the driving distance. It would take 1 day 7 hours to go from St Peters, Missouri to Arcadia, California.
The flight distance (direct flight from St Peters, MO to Arcadia, CA) is 1,551.43 mi.
1,806 mi = 2,907.10 kms