Are you sure it's the Dream or is another ship. The Dream is sailing out of Port Canaveral and the nearest airport is Orlando.
If you must, and I mean must, fly out on the same day then make sure you have Travel Insurance that covers missing the cruise and travel delay.
Cruise air sends thousands of people in the same day and the VAST majority of them make it so the odds are in your favor. Just leave at least three hours from touchdown to final boarding.