There are
1,929 mi
from Missoula, MT to Deer Park, TX
That's the driving distance. It would take 1 day 9 hours to go from Missoula, Montana to Deer Park, Texas.
The flight distance (direct flight from Missoula, MT to Deer Park, TX) is 1,558.52 mi.
1,929 mi = 1.61 kms