There are
1,456 mi
from Brownsville, TX to Watertown, SD
That's the driving distance. It would take 1 day 2 hours to go from Brownsville, Texas to Watertown, South Dakota.
The flight distance (direct flight from Brownsville, TX to Watertown, SD) is 1,312.79 mi.
1,456 mi = 1.61 kms