There are
2,053 mi
from Longmont, CO to Deerfield Beach, FL
That's the driving distance. It would take 1 day 12 hours to go from Longmont, Colorado to Deerfield Beach, Florida.
The flight distance (direct flight from Longmont, CO to Deerfield Beach, FL) is 1,723.24 mi.
2,053 mi = 3.22 kms