There are
1,707 mi
from Barstow, CA to Clayton, MO
That's the driving distance. It would take 1 day 5 hours to go from Barstow, California to Clayton, Missouri.
The flight distance (direct flight from Barstow, CA to Clayton, MO) is 1,494.44 mi.
1,707 mi = 2,747.95 kms