There are
1,820 mi
from Missoula, MT to Seymour, IN
That's the driving distance. It would take 1 day 7 hours to go from Missoula, Montana to Seymour, Indiana.
The flight distance (direct flight from Missoula, MT to Seymour, IN) is 1,514.56 mi.
1,820 mi = 1.61 kms