There are
1,771 mi
from Missoula, MT to Harker Heights, TX
That's the driving distance. It would take 1 day 6 hours to go from Missoula, Montana to Harker Heights, Texas.
The flight distance (direct flight from Missoula, MT to Harker Heights, TX) is 1,394.27 mi.
1,771 mi = 1.61 kms