The following was taken from the MouseSavers site - for the extrememly budget concious, this could be very useful information.
If you are traveling light (i.e. one carry-on), it is possible to take a public bus from the airport to Disney World and accomplish your trip for than the cost of the tip you would pay a taxi or shuttle driver, or the cost of tolls with a rental car!
The trip from the airport to the Ticket and Transportation Center at WDW takes an hour and a half, with the bus leaving the airport every hour. You take Bus 11 from the airport and then transfer to Bus 50 at the downtown bus station. (There is a web site with bus schedules.) The cost is $1.10 one way. You need to ask for a transfer when you board the bus at the airport. When you get to the Ticket and Transportation Center you can take the ferry across to the Magic Kingdom and catch the Disney bus to your resort.
If you have a late flight on the last day of your stay, after you check out of your hotel you can store your luggage at the lockers at the Ticket and Transportation Center ($1) and spend the day at the Magic Kingdom, then leave the Magic Kingdom a half-hour before the bus is due, which will give you time to get your luggage and be waiting for the bus.
If you are traveling light (i.e. one carry-on), it is possible to take a public bus from the airport to Disney World and accomplish your trip for than the cost of the tip you would pay a taxi or shuttle driver, or the cost of tolls with a rental car!
The trip from the airport to the Ticket and Transportation Center at WDW takes an hour and a half, with the bus leaving the airport every hour. You take Bus 11 from the airport and then transfer to Bus 50 at the downtown bus station. (There is a web site with bus schedules.) The cost is $1.10 one way. You need to ask for a transfer when you board the bus at the airport. When you get to the Ticket and Transportation Center you can take the ferry across to the Magic Kingdom and catch the Disney bus to your resort.
If you have a late flight on the last day of your stay, after you check out of your hotel you can store your luggage at the lockers at the Ticket and Transportation Center ($1) and spend the day at the Magic Kingdom, then leave the Magic Kingdom a half-hour before the bus is due, which will give you time to get your luggage and be waiting for the bus.