There are
712 mi
from Elgin, IL to Gaithersburg, MD
That's the driving distance. It would take 13 hours 27 mins to go from Elgin, Illinois to Gaithersburg, Maryland.
The flight distance (direct flight from Elgin, IL to Gaithersburg, MD) is 614.21 mi.
712 mi = 1,145.88 kms