There are
1,675 mi
from Garland, TX to Missoula, MT
That's the driving distance. It would take 1 day 5 hours to go from Garland, Texas to Missoula, Montana.
The flight distance (direct flight from Garland, TX to Missoula, MT) is 1,327.46 mi.
1,675 mi = 1.61 kms