I'm going by memory so you should check this. For Chetumal Fri., Sat., & Sun. Leaves SP at 7 or 7:30 and leaves Chetumal 3PM. No stops. It is about 1/1/2 Hours. I found a schedule on line but don't remember where. Sorry I don't have time to look right now. Good Luck. It was a pleasant trip and cab fares in Mexico where inexpensive.
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Jim
We can't direct the wind but we can adjust the sails.