There are
2,067 mi
from St Charles, MO to Sunnyvale, CA
That's the driving distance. It would take 1 day 11 hours to go from St Charles, Missouri to Sunnyvale, California.
The flight distance (direct flight from St Charles, MO to Sunnyvale, CA) is 1,708.85 mi.
2,067 mi = 3,326.12 kms