There are several companies that you can contact to arrange your bus trips;

Mexbus
Phone (Mexico): (52-55) 5522 4820
Phone (Mexico, tollfree): 01800-523-9412
Email: info@mexbus.net
Web: http://www.mexbus.net

Estrella de Oro
Phone (USA): (not available)
Phone (Mexico): (not available)
Email: (not available)
Web: http://www.estrelladeoro.com.mx


Omnibus de Mexico
Phone (USA): (not available)
Phone (Mexico): (not available)
Email: (not available)
Web: http://www.omnibusdemexico.com.mx


Uno
Phone (Mexico): 51-33-24-24
Email: info@uno.com.mx
Web: http://www.uno.com.mx


Omni Tour del Caribe (Línea Europea)
Av. Salvador Novo. 179
Chetumal, Quintana Roo
Phone: (983) 832-7978, 832-7889
Web: (not available)


ADO
Av. Salvador Novo No. 179. Terminal de Autobuses de Chetumal
Chetumal, Quintana Roo
Phone: (983) 832-5110
Email:sarellano@grupoado.com.mx
Web: http://www.ado.com.mx


Soc. Coop. Operadores del Caribe SCL
Av. Salvador Novo No. 179. Terminal de Autobuses de Chetumal
Chetumal, Quintana Roo
Phone: (983) 832-5100
Web: (not available)


ÓMNIBUS CRISTÓBAL COLÓN
Av. Salvador Novo No. 179. Terminal de Autobuses de Chetumal
Chetumal, Quintana Roo
Phone: (983) 832-5110
Web: http://www.cristobalcolon.com.mx


MAYAB
Av. Salvador Novo No. 179. Terminal de Autobuses de Chetumal
Chetumal, Quintana Roo
Phone: (983) 832-5110
Web: (not available)

TicketbusReservations
Phone: 51332424
Phone (tollfree): 01-800-7028000
Email: supcit@grupoado.com.mx
Web: http://www.ticketbus.com.mx