There are
1,714 mi
from Great Falls, MT to Lufkin, TX
That's the driving distance. It would take 1 day 6 hours to go from Great Falls, Montana to Lufkin, Texas.
The flight distance (direct flight from Great Falls, MT to Lufkin, TX) is 1,418.24 mi.
1,714 mi = 2,758.55 kms