There are
2,228 mi
from Missoula, MT to Harrisburg, PA
That's the driving distance. It would take 1 day 15 hours to go from Missoula, Montana to Harrisburg, Pennsylvania.
The flight distance (direct flight from Missoula, MT to Harrisburg, PA) is 1,894.98 mi.
2,228 mi = 3.22 kms