There are
445 mi
from Gaithersburg, MD to Piqua, OH
That's the driving distance. It would take 8 hours 53 mins to go from Gaithersburg, Maryland to Piqua, Ohio.
The flight distance (direct flight from Gaithersburg, MD to Piqua, OH) is 380.83 mi.
445 mi = 715.64 kms