There are
2,048 mi
from Pittsburg, CA to St Louis, MO
That's the driving distance. It would take 1 day 11 hours to go from Pittsburg, California to St Louis, Missouri.
The flight distance (direct flight from Pittsburg, CA to St Louis, MO) is 1,709.34 mi.
2,048 mi = 3,296.30 kms