There are
2,090 mi
from Brownsville, TX to Missoula, MT
That's the driving distance. It would take 1 day 12 hours to go from Brownsville, Texas to Missoula, Montana.
The flight distance (direct flight from Brownsville, TX to Missoula, MT) is 1,707.25 mi.
2,090 mi = 3.22 kms