By long-distance bus

Every international bus arrives at the same place — Tres Cruces, Montevideo's main terminal, on Bulevar General Artigas. Argentine services leave from Retiro in Buenos Aires; Brazilian ones from Porto Alegre, with a summer run from Florianópolis.

From Argentina, four companies work the corridor, all crossing at Fray Bentos: Cauvi runs it about four times a week in roughly eight hours; Bus de la Carrera goes daily; Pullman General Belgrano runs a nightly service, leaving late and arriving early; and EGA covers it too, with an onward reach as far as Córdoba. From Brazil, EGA and TTL Turismo — the latter with seventy years on the route — run from Porto Alegre through Pelotas and across at Chuy, about twelve hours.

Fares shift with the season and the exchange rate, and none of these companies keeps a reliable public price list, so treat any number as a starting point and confirm when you book.

The bike is the real question, and the honest answer is that nobody publishes a policy. Not one of the operators states, on its own site, whether a boxed bicycle rides in the hold. The closest guide is Argentine domestic practice, where a bike goes under the bus with the front wheel off and the frame wrapped in cardboard or film, for a modest surcharge of roughly thirteen to twenty-five dollars. Assume the same here, and call the company forty-eight to seventy-two hours ahead to make sure there's room and agreement.

At the border, a bus crossing means everyone gets off — at Chuy, passengers disembark at the highway post while the driver takes the passports through, which can add meaningful time to the journey. Leaving Argentina, customs may register your bike's serial number or fit a seal (a precinto) if it looks new. A used touring bike most likely counts as personal sporting equipment rather than something to declare, but it's worth confirming at the border rather than assuming.

If the bus feels like too many unknowns, compare it with the ferry, whose bike policy is at least written down.