There is a metro station in T3. It goes to several locations in the city and to Jumeirah Beach. Union Square is the name of the station in the old town and Deira.
Car and bus
The airport is located approximately 4 kilometers south east of downtown Dubai. The Airport Road runs right along the airport to the center in a southeasterly direction.
Luxury buses (Dubai International Airport Buses) to downtown Dubai and several hotels leave in front of terminals 1 and 2. The city busses 4, 11, 15, 33, 44 leave from T1 to the center. Bus service 2 leaves from T2.
Car rental Dubai International Airport
The car rental agencies are located in T1: A Sia, Autolease, Budget, Continental, Diamond Lease, Dollar, Europcar, Hertz, Patriot, National, Sixt, Thrifty and United Car. You can also book a rental car in advance at EasyTerra, this website compares multiple car rental agencies and their rates simultaneously.
Taxicabs are available in front of terminals 1, 2 and 3 (with meters).
Parking at the airport
All terminals at Dubai Airport have short and long term parking facilities. Parking for one day costs between AED 140.00 to AED 560.00