There are
1,083 mi
from Ottawa, KS to Gaithersburg, MD
That's the driving distance. It would take 20 hours 37 mins to go from Ottawa, Kansas to Gaithersburg, Maryland.
The flight distance (direct flight from Ottawa, KS to Gaithersburg, MD) is 970.82 mi.
1,083 mi = 1,742.27 kms