There are
2,067 mi
from Kalispell, MT to Port Lavaca, TX
That's the driving distance. It would take 1 day 12 hours to go from Kalispell, Montana to Port Lavaca, Texas.
The flight distance (direct flight from Kalispell, MT to Port Lavaca, TX) is 1,649.14 mi.
2,067 mi = 3,326.86 kms