There are
1,698 mi
from Great Falls, MT to Schertz, TX
That's the driving distance. It would take 1 day 5 hours to go from Great Falls, Montana to Schertz, Texas.
The flight distance (direct flight from Great Falls, MT to Schertz, TX) is 1,421.72 mi.
1,698 mi = 2,732.50 kms