If you've purchased the
DCL transfers, it's $59 per person round trip. They pick up at various resorts at Disney World, so you wouldn't have to go all the way back to the airport. So for the $59 you would have transportation from a WDW resort, to the port and then back to the airport.
Depending on how many people are in your party, it's sometimes less expensive to do a rental car or even a car service. For instance the average luxury sedan service (4 maximum) is $210 for the ride from the resort to the port and then back to the airport. With tip, it's about the same as the DCL bus, but you can set the pick up time and perhaps spend another hour or two at Disney if you wanted. To save even more money, you could take the Magical Express back to the airport and do a one-way rental with Budget. That's the least convenient option, but would end up being the least expensive. You could drive down to the ship from the airport and drop your party and their luggage curbside, return the car to the Budget terminal near the port and take their shuttle back to the ship. When you get back from your cruise, you can get the shuttle curbside, go back to Budget for another car, drive to the port, pick up your party and return to the airport. In total, that option would average you around $100 for the car, gas and tolls.
As an FYI, there is also a
Disney cruise line forum on these boards. If you have a chance, you might want to take a look over there too. Here's the link,
Disney Cruise forum.
Tammi