511 miles
It is 588 miles according to Google Maps.
The distance between Helena MT and Houston TX is about 1,826 road miles.
141 miles taking this route:Take I-90 WEST from Bozeman to I-15 NORTH to HELENA at EXIT 227 near Butte.Take I-15 NORTH to Helena.
676 miles
225 miles taking this route:Take U.S. 2 EAST, from Browning, to I-15 SOUTH to GREAT FALLS.Take I-15 SOUTH to Helena.
The driving distance from Seattle, WA to Miles City, MT is about 962 road miles.
590 milesThis is the route:Take U.S. 12 WEST, from Helena, to I-90 WEST.Take I-90 WEST to Seattle.
655434 miles
792 miles
It is 588 miiles according to Google Maps.
Seattle to Billings is 818 road miles.
It would take between 1 and 2 days for a letter to get from Miles City, MT to East Helena, MT with a first class mail service.