There are
1,179 mi
from St Charles, MO to Gallup, NM
That's the driving distance. It would take 20 hours 33 mins to go from St Charles, Missouri to Gallup, New Mexico.
The flight distance (direct flight from St Charles, MO to Gallup, NM) is 1,027 mi.
1,179 mi = 1,896.82 kms