There are
1,823 mi
from Chatham, IL to Pendleton, OR
That's the driving distance. It would take 1 day 7 hours to go from Chatham, Illinois to Pendleton, Oregon.
The flight distance (direct flight from Chatham, IL to Pendleton, OR) is 1,525.02 mi.
1,823 mi = 2,934.52 kms