There are
1,050 mi
from Rockville, MD to Lenexa, KS
That's the driving distance. It would take 20 hours 5 mins to go from Rockville, Maryland to Lenexa, Kansas.
The flight distance (direct flight from Rockville, MD to Lenexa, KS) is 942.33 mi.
1,050 mi = 1,690.58 kms