There are
2,553 mi
from Missoula, MT to Waltham, MA
That's the driving distance. It would take 1 day 21 hours to go from Missoula, Montana to Waltham, Massachusetts.
The flight distance (direct flight from Missoula, MT to Waltham, MA) is 2,100.29 mi.
2,553 mi = 3.22 kms