There are
347 mi
from Gaithersburg, MD to Conneaut, OH
That's the driving distance. It would take 6 hours 36 mins to go from Gaithersburg, Maryland to Conneaut, Ohio.
The flight distance (direct flight from Gaithersburg, MD to Conneaut, OH) is 261.73 mi.
347 mi = 558.55 kms