There are
1,565 mi
from Missoula, MT to Oswego, IL
That's the driving distance. It would take 1 day 3 hours to go from Missoula, Montana to Oswego, Illinois.
The flight distance (direct flight from Missoula, MT to Oswego, IL) is 1,312.70 mi.
1,565 mi = 1.61 kms