There are
1,946 mi
from Harlingen, TX to Butte, MT
That's the driving distance. It would take 1 day 10 hours to go from Harlingen, Texas to Butte, Montana.
The flight distance (direct flight from Harlingen, TX to Butte, MT) is 1,594.10 mi.
1,946 mi = 3,132.21 kms