There are
1,576 mi
from Missoula, MT to Lemont, IL
That's the driving distance. It would take 1 day 3 hours to go from Missoula, Montana to Lemont, Illinois.
The flight distance (direct flight from Missoula, MT to Lemont, IL) is 1,329.39 mi.
1,576 mi = 1.61 kms