There are
1,798 mi
from St Charles, IL to Pullman, WA
That's the driving distance. It would take 1 day 7 hours to go from St Charles, Illinois to Pullman, Washington.
The flight distance (direct flight from St Charles, IL to Pullman, WA) is 1,456.32 mi.
1,798 mi = 2,893.77 kms