There are
1,466 mi
from Missoula, MT to Altus, OK
That's the driving distance. It would take 1 day 1 hour to go from Missoula, Montana to Altus, Oklahoma.
The flight distance (direct flight from Missoula, MT to Altus, OK) is 1,138.19 mi.
1,466 mi = 1.61 kms