There are
1,820 mi
from Pendleton, OR to St Charles, MO
That's the driving distance. It would take 1 day 7 hours to go from Pendleton, Oregon to St Charles, Missouri.
The flight distance (direct flight from Pendleton, OR to St Charles, MO) is 1,513.57 mi.
1,820 mi = 2,929.77 kms