There are
1,043 mi
from Flagstaff, AZ to Missoula, MT
That's the driving distance. It would take 18 hours 16 mins to go from Flagstaff, Arizona to Missoula, Montana.
The flight distance (direct flight from Flagstaff, AZ to Missoula, MT) is 814.96 mi.
1,043 mi = 1,678.45 kms