BEST WAY DOWNTOWN:
The airport is seven miles (11 km) northwest of downtown Miami.
Miami International has a rather limited Web site that provides basic information including:
Taxis are available outside each terminal. You go to a dispatcher, give him your destination, and he will direct you to the correct taxi. This is important because there are special taxis for short rides in the vicinity of the airport. The trip to downtown will take about 20 minutes. Typical fares are $12-15 to Coral Gables, $15-18 to downtown, and $20 -25 to Miami Beach.
Supershuttle vans operate 24 hours a day for pickup at the airport. You can book in advance, but it is just as easy to call them when you exit baggage claim. There will be a van coming to the road just outside of the terminal to pick you up shortly. Supershuttle vans service all areas in and around Miami. The fare to downtown will be about $8, and to the Miami Beach area about $14.
Many of the major hotels provide a van service from the airport. Check when making your reservation.
Alamo, Avis, Budget, Dollar, Enterprise, General, Hertz, National, Payless, Sears, and Thrifty all have counters in the airport, but you have to take a shuttle bus to the area where the cars are. The shuttle buses are numerous and cruise the road outside of the arrivals area where you simply signal the one you need.
There are also many local car rental companies in Miami. If you are staying in a downtown hotel, it may be more cost effective to search out one of the local companies in the downtown area when you actually need the car.
World Airport Information
Adapted from How to Get Out of the Airport