There are
882 mi
from Iowa City, IA to Gaithersburg, MD
That's the driving distance. It would take 16 hours 25 mins to go from Iowa City, Iowa to Gaithersburg, Maryland.
The flight distance (direct flight from Iowa City, IA to Gaithersburg, MD) is 772.73 mi.
882 mi = 1,418.68 kms