There are
811 mi
from Waltham, MA to Piqua, OH
That's the driving distance. It would take 15 hours 42 mins to go from Waltham, Massachusetts to Piqua, Ohio.
The flight distance (direct flight from Waltham, MA to Piqua, OH) is 692.18 mi.
811 mi = 1,305.03 kms