There are
1,510 mi
from Great Falls, MT to Saginaw, TX
That's the driving distance. It would take 1 day 2 hours to go from Great Falls, Montana to Saginaw, Texas.
The flight distance (direct flight from Great Falls, MT to Saginaw, TX) is 1,246.63 mi.
1,510 mi = 2,430.23 kms