There are
1,536 mi
from Deerfield Beach, FL to Johnston, IA
That's the driving distance. It would take 1 day 4 hours to go from Deerfield Beach, Florida to Johnston, Iowa.
The flight distance (direct flight from Deerfield Beach, FL to Johnston, IA) is 1,312.72 mi.
1,536 mi = 2,472.57 kms