Cancun

By plane

Cancún International Airport (IATA: CUN) is Mexico’s second busiest airport and is about 10km (6 mi) from south end of the hotel strip (Zona Hotelera) and 16km (9 mi) southwest of downtown.

One of Cancun’s best features is its transport links, as most major air carriers in North, Central, and South America, have services to Cancun. There are some extremely cheap charter flight deals available from the UK (from around GBP150) as well as commercial flight deals from several European carriers. International flights within Latin America are usually expensive such as those coming from Central and South America.

Airlines that fly to Cancun from:

Mexico City: and other cities within Mexico include: Aeromexico/Aeromexico Connect, Interjet, Volaris, MayAir, Magnicharters, and VivaAerobus;
Central America: Avianca El Salvador (formerly Taca & Taca Regional), Tropic Air (to Belize City), and Copa (Panama City);
USA: Aeromexico, Alaska Airlines, American Airlines, Delta, United, Jetblue, Sun Country, Frontier, Miami Air International (Charter), Southwest, Spirit, Virgin America, Apple Vacations (operated by Frontier and Allegiant), Vacation Express (operated by Aeromexico, Miami Air International & Sunwing from the U.S. & Canada) (Most flights from the USA are regularly scheduled flights);
South America: Avianca Colombia, LAN, LAN Peru & White Jets;
Canada: Air Canada, Air Transat, CanJet, Enerjet, Sunwing, WestJet (Except Sunwing, Westjet and Air Canada the others operate on a seasonal basis from Canada or as chartered.);
Cuba: Cubana de Aviacion and Aeromexico;
Europe & Russia: Aeroflot, Air Berlin, Air France, British Airways, Air Europa, Blue Panaroma, Condor, Edelwiess, Jetairfly, LOT Polish, Monarch, White, Pullmantur, Thomas Cook, Thomson, Transaero, TUIFly, Virgin Atlantic, XL Airways and White (Portugal). (Some or most European, Canadian and South American carriers come on a seasonal basis and/or as a charter, usually during the northern winters while others operate year round as a regularly scheduled or chartered flight. Check with the airline individually).

By bus

The main bus station is at Calle Pino, SM23, MZ56, Lt 1 y 2 which is at the 10 o’clock position (northwest, north is at the 12 o’clock position) of the roundabout at Av Tulum & Av Uxmal in downtown (El Centro). The following bus companies operate buses to/from here (Note: The 800 toll free numbers are for calling from within Mexico unless stated otherwise. Other numbers are regular or local numbers. From outside Mexico you will have to call the regular numbers):

ADO (Autobuses de Oriente), ☎ +52 55 5133-5133 (toll free: 800 009 9090), [1]. operates ADO & OCC first class, ADO GL Deluxe & ADO Platino on longer routes to various major cities in Yucatan (Merida 4hr20 MXN356-428), Campeche, Quintana Roo (including Play del Carmen (1hr20 MXN58) & Tulum (2hr20 MXN128), Tobasco, Chiapas & Oaxaca states and to/from Mexico DF (MXN1800-2200 pesos or USD135.80-166 for 23-25hrs (2hr20 MXN128)). ADO buses to/from the airport (:30min MXN62) are also here. They also operate the Oriente, Mayab, and Sureste second class buses to various cities and towns in Quintana Roo and Yucatan such as to Tulum, Felipe Carrillo Puerto, Puerto Morleos, Playa del Carmen, etc. The Autotur brand is their charter or bus rental subsidiary for group travel, such as organized tours. edit
AutoCentro, Calle 46 No 517, por 65 y 67; Merida, YUC, ☎ +52 999 923 9962, [2]. operates second class bus service between Cancun & Merida via Tixpeual, Tixkokob, Euan, Cacalchen, Izamal, Tunkas, Dzitas, Valladolid, Chemax, Xcan and/or Leona on three different routes. These buses stop anywhere along the road to pick up and drop off people on request edit

Private Transfer

You can also pre-book a private transfer from the airport to your destination.

There is a taxi stand in front of the bus station (street side) which are cheaper than a direct (private) transfer from the airport.

Source/http://wikitravel.org