There are
1,041 mi
from Frederick, MD to Leavenworth, KS
That's the driving distance. It would take 19 hours 57 mins to go from Frederick, Maryland to Leavenworth, Kansas.
The flight distance (direct flight from Frederick, MD to Leavenworth, KS) is 934.03 mi.
1,041 mi = 1,675.50 kms