There are
890 mi
from West Allis, WI to Northampton, MA
That's the driving distance. It would take 18 hours 7 mins to go from West Allis, Wisconsin to Northampton, Massachusetts.
The flight distance (direct flight from West Allis, WI to Northampton, MA) is 780.97 mi.
890 mi = 1,433.04 kms