There are
708 mi
from Hoffman Estates, IL to Gaithersburg, MD
That's the driving distance. It would take 13 hours 20 mins to go from Hoffman Estates, Illinois to Gaithersburg, Maryland.
The flight distance (direct flight from Hoffman Estates, IL to Gaithersburg, MD) is 606.85 mi.
708 mi = 1,138.98 kms