There are
1,729 mi
from Missoula, MT to Herrin, IL
That's the driving distance. It would take 1 day 6 hours to go from Missoula, Montana to Herrin, Illinois.
The flight distance (direct flight from Missoula, MT to Herrin, IL) is 1,413.35 mi.
1,729 mi = 1.61 kms