There are
942 mi
from St Charles, MO to North Plainfield, NJ
That's the driving distance. It would take 18 hours 7 mins to go from St Charles, Missouri to North Plainfield, New Jersey.
The flight distance (direct flight from St Charles, MO to North Plainfield, NJ) is 863.10 mi.
942 mi = 1,516.01 kms