Miles between Gaithersburg, MD and Johnston, IA

There are
994 mi
from Gaithersburg, MD to Johnston, IA

That's the driving distance. It would take 18 hours 22 mins to go from Gaithersburg, Maryland to Johnston, Iowa.

The flight distance (direct flight from Gaithersburg, MD to Johnston, IA) is 884.25 mi.

994 mi = 1,599.94 kms