There are
2,057 mi
from St Charles, MO to Covington, WA
That's the driving distance. It would take 1 day 11 hours to go from St Charles, Missouri to Covington, Washington.
The flight distance (direct flight from St Charles, MO to Covington, WA) is 1,686.74 mi.
2,057 mi = 3,310.57 kms