There are
1,227 mi
from Great Falls, MT to Glendale, AZ
That's the driving distance. It would take 21 hours 32 mins to go from Great Falls, Montana to Glendale, Arizona.
The flight distance (direct flight from Great Falls, MT to Glendale, AZ) is 965.75 mi.
1,227 mi = 1,974.45 kms