There are
2,035 mi
from St Charles, MO to Tualatin, OR
That's the driving distance. It would take 1 day 11 hours to go from St Charles, Missouri to Tualatin, Oregon.
The flight distance (direct flight from St Charles, MO to Tualatin, OR) is 1,702.76 mi.
2,035 mi = 3,275.81 kms