Mexicana's suspension of operations, along with its regional carrier, Click, leaves Chetumal (airport code CTM) with no service from the U.S. The Mexican airline Interjet (tel. 866/285-9525 in the U.S.; www.interjet.com.mx) flies there through its Mexico City hub from a dozen airports all over Mexico. The airport is west of town, just north of the entrance from the highway.
Chetumal is just over 3 hours from Tulum. If you're continuing to Belize, be aware that rental companies don't allow you to take their cars across the border. To get to the ruins of Tikal in Guatemala, you must go through Belize to the border crossing at Ciudad Melchor de Mencos.
The main bus station (tel. 983/832-5110) is 20 blocks from the town center on Insurgentes at Avenida Héroes. Buses go to Cancún, Tulum, Playa del Carmen, Puerto Morelos, Mérida, Campeche, Villahermosa, and Tikal, Guatemala.
To Belize: Buses depart from the Lázaro Cárdenas market, most often called Mercado Nuevo (Héroes and Circuito). Ask for Autobuses Novelo, which has local service throughout the day (140 pesos) and several express buses per day (185 pesos).
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.