There are
1,563 mi
from Missoula, MT to Downers Grove, IL
That's the driving distance. It would take 1 day 3 hours to go from Missoula, Montana to Downers Grove, Illinois.
The flight distance (direct flight from Missoula, MT to Downers Grove, IL) is 1,325.10 mi.
1,563 mi = 1.61 kms