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; Flecha Bus, which now sells Pullman General Belgrano's tickets, runs nightly, 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 answer depends on whose coach it is. Start with a phone call, forty-eight to seventy-two hours ahead, because only one company on the Buenos Aires run spells out how a bike travels. That is Flecha Bus: a bicycle counts as special luggage, carried subject to space in the hold, or sent as freight for a fee. Cóndor Estrella, one of the companies behind Bus de la Carrera, lists bicycles among what it will not carry as luggage. Cauvi, EGA and TTL say nothing about a passenger's bike, though EGA prices one in the freight tariff for its Melo line, a domestic route. If the company you call has no rule, expect Argentine domestic practice: front wheel off, frame wrapped in cardboard or film, and a surcharge of roughly thirteen to twenty-five dollars. Inside Uruguay it works differently, and COT books a bicycle as a parcel rather than as luggage.

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, where Colonia Express puts its bike policy in writing.