I have cruised out of Port Canaveral before on the Mariner. The drive from Orlando Airport to the Port is about 35 to 40 minutes. My rule is that I never book a flight before 12pm. This allows me for enough time to get off the ship, travel back to the airport and check in with my airline. My travel agent also recommends not booking a flight before 12pm. If I were you, to play it safe I would change my flight. Eventhough the ship docks at 7am, it takes awhile for them to unload the luggage and to get proper clearance for debarkation.