There are
2,629 mi
from San Marcos, CA to Deerfield Beach, FL
That's the driving distance. It would take 1 day 22 hours to go from San Marcos, California to Deerfield Beach, Florida.
The flight distance (direct flight from San Marcos, CA to Deerfield Beach, FL) is 2,261.15 mi.
2,629 mi = 3.22 kms