There are
1,704 mi
from Chatham, IL to Kalispell, MT
That's the driving distance. It would take 1 day 5 hours to go from Chatham, Illinois to Kalispell, Montana.
The flight distance (direct flight from Chatham, IL to Kalispell, MT) is 1,350.75 mi.
1,704 mi = 2,742.96 kms