There are
2,321 mi
from Missoula, MT to Middletown, DE
That's the driving distance. It would take 1 day 17 hours to go from Missoula, Montana to Middletown, Delaware.
The flight distance (direct flight from Missoula, MT to Middletown, DE) is 1,976.03 mi.
2,321 mi = 3.22 kms