There are
1,619 mi
from Missoula, MT to Cahokia, IL
That's the driving distance. It would take 1 day 4 hours to go from Missoula, Montana to Cahokia, Illinois.
The flight distance (direct flight from Missoula, MT to Cahokia, IL) is 1,331.40 mi.
1,619 mi = 1.61 kms