Is it safe to travel by bus at night?

Generally, no. Stick to daytime buses, especially in remote regions of Peru and Bolivia, to avoid robberies and navigating mountain roads in poor visibility.

Do I need to book buses weeks in advance?

No. Aside from holiday periods like Semana Santa or Christmas, you can almost always buy a ticket the day before.

Planning an overland route from Colombia to Argentina

Crossing South America overland requires navigating the Darién Gap by air or boat, then prioritizing a north-to-south bus route through the Andes. You should allocate at least 3 months to complete this 9,000-mile journey without feeling like you are living on a bus.

Bypass the Darién Gap. There is no road between Panama and Colombia. You must fly from Panama City to Medellín or Bogotá, or book a 5-day sailboat expedition from Carti/San Blas to Sapzurro/Capurganá.
Secure your bus routes. Use 'RedBus' or 'Busbud' to check regional connectivity. In countries like Peru and Bolivia, buy tickets at the terminal 24 hours in advance to save on booking fees.
Plan for altitude. You will be crossing high-altitude regions (the Altiplano). Spend at least 3 days in cities like Cusco or La Paz to acclimate before taking long-haul mountain buses to avoid altitude sickness.
Manage border crossings. Always carry your physical passport and at least 5 printed copies. Some remote border crossings require a 'Salida' stamp from the local police if you aren't using a major terminal.

Is it safe to travel by bus at night?: Generally, no. Stick to daytime buses, especially in remote regions of Peru and Bolivia, to avoid robberies and navigating mountain roads in poor visibility.
Do I need to book buses weeks in advance?: No. Aside from holiday periods like Semana Santa or Christmas, you can almost always buy a ticket the day before.