There are
1,701 mi
from Barstow, CA to Lake St Louis, MO
That's the driving distance. It would take 1 day 5 hours to go from Barstow, California to Lake St Louis, Missouri.
The flight distance (direct flight from Barstow, CA to Lake St Louis, MO) is 1,469.74 mi.
1,701 mi = 2,738.20 kms