travel from belize to cancun

Bus

Use Search option or just Google. No ferries, flying is $$$.

1. Flights -- none

2. Water taxi
   Nothing between Belize and Cancun.
   There are two daily water taxis between Chetumal and Ambergris Caye with a connecting water taxi between Ambergris and Caye Caulker.
   Then get to Cancun by ADO express bus.
   Links to the water taxi websites are on the BelizeBus site (click the link on my profile page).

3. ADO Bus
   ADO express buses operate between Belize City & Mexico.

Cancun to Belize City
Departs from Cancun bus terminal daily at 10:15 pm; from Playa del Carmen at 11:40 pm; from Tulum at 12:45 am.
Fares to BC: MX$492 from Cancun; MX$456 from Playa; MX$396 from Tulum.
Trip time: 8:10 hours.

Belize City to Cancun
Departs from BC bus terminal daily at 7:30 pm with stops at Orange Walk (9:00 pm), Corozal (10:00 pm), Tulum (4:00 am), Playa del Carmen (5:00 am) and Cancun Airport (6:30 am). Arrives at Cancun bus terminal at 7:00 am.
Fares: BZ$55.00 to Tulum; BZ$63.00 to Playa del Carmen; BZ$79.00 to Cancun (one way).

Merida to Belize City
Departs from Merida Terminal Alta Brisa daily at 9 pm with stops at Corozal and Orange Walk.
Fare to BC: MX$492
Trip time: 8:30 hours.

Belize City to Merida
Departs from BC bus terminal daily at 7:00 pm with stops at Orange Walk (8:30 pm), Corozal (9:30 pm), and the most important hospitals in Merida (ORAM, Juárez, Clínica Mérida, Star Médica). Arrives at Terminal Alta Brisa at 6:00 am.
Fare: BZ$79.00 (one way).

Here’s the link to the ADO website:
http://www.ado.com.mx/ado/index.jsp

The fares have been changing recently -- check the website for updates.

1. Belize Buses
   Belize buses go as far as Chetumal.

Just buy your ticket in Belize City the day of departure (I purchased mine 20 minutes before the bus departed, maybe it was ADO). Once in Chetumal (Mexican side of the border) you're able to catch another bus to Cancun that drops you off at the main station in town. Customs were a cakewalk.
http://www.travelyucatan.com/cancun_map.gif
You can print up and use the above link for orientation after arriving in downtown Cancun. Unfortunately it lists the pricey hotels and not hostels... that's what the LP book is for I suppose.