There are
1,552 mi
from Missoula, MT to Mt Prospect, IL
That's the driving distance. It would take 1 day 2 hours to go from Missoula, Montana to Mt Prospect, Illinois.
The flight distance (direct flight from Missoula, MT to Mt Prospect, IL) is 1,321.41 mi.
1,552 mi = 1.61 kms