There are
1,819 mi
from Fullerton, CA to Lake St Louis, MO
That's the driving distance. It would take 1 day 7 hours to go from Fullerton, California to Lake St Louis, Missouri.
The flight distance (direct flight from Fullerton, CA to Lake St Louis, MO) is 1,542.13 mi.
1,819 mi = 1.61 kms