Three Days in Uruguay: Colonia del Sacramento and Montevideo

This itinerary spends three full days on the Uruguayan side of the Río de la Plata rather than treating Uruguay as an afternoon excursion. It is built around two distinct legs run by two distinct companies: a ferry across the river to Colonia del Sacramento, and a local overland bus onward to Montevideo. There is no single ticket that covers the whole loop, and it is worth saying plainly upfront so nobody plans around one: the ferry operator sells you to Colonia, a Uruguayan bus company sells you from Colonia to Montevideo, and either the ferry company or an airline sells you back to Buenos Aires. Three separate bookings, three separate confirmations.

Why give Uruguay three full days

Most visitors to Buenos Aires treat Colonia as a single long day: ferry over, walk the cobbles for a few hours, ferry back before dinner. That works, and there is a whole day-trip guide built around exactly that version. This itinerary is for a different traveller — someone who wants to actually stay the night in Uruguay, walk Colonia’s streets at the quiet hours when the day-trippers have gone home, and then see Montevideo as a real capital rather than skip it altogether.

It costs an extra night or two of accommodation and a bus fare that a same-day trip never has to pay, but it removes the two worst features of the rushed version: the anxious clock-watching in Colonia, and the near-total absence of Montevideo from most people’s Argentina trip.

Before anything else, a border note. Uruguay is not a province, a day-trip add-on, or an extension of Argentina — it is a separate sovereign country. That means a passport check and immigration formalities at the Puerto Madero ferry terminal before boarding, a stamp on arrival in Colonia, and a different currency, the Uruguayan peso (UYU), waiting on the other side. Argentine pesos are not usable as local currency in Uruguay. Treat the crossing with the same seriousness as a short flight abroad: passport in hand, arrive at the terminal with time to clear the check, and don’t expect an Argentine SUBE card or Argentine cash to do anything useful once you land.

Day 1: Ferry to Colonia del Sacramento and the old town

Start the day at the ferry terminal at Puerto Madero. The fast crossing to Colonia del Sacramento takes roughly an hour, and because it is an international crossing, plan to arrive well before departure to clear the check-in and passport control on the Argentine side. Buquebus and Colonia Express both run this route with several daily sailings; whichever you book, keep the confirmation and your passport together, since you’ll need both again on the Uruguayan side within the hour.

Landing in Colonia del Sacramento puts you inside one of the best-preserved colonial quarters on this coast, and a UNESCO World Heritage Site. The Barrio Histórico changed hands between Portugal and Spain more than once, and the mix shows in the street plan itself: the Portuguese laid streets that curve slightly to break the wind, while the later Spanish grid sits at an angle beside them. Spend the afternoon simply walking — the Calle de los Suspiros (Street of Sighs), the lighthouse rising from the ruins of a convent, the small plazas shaded by sycamores, and the waterfront promenade where the river turns the same wide brown as it does at Puerto Madero, just with fewer people watching it.

Check into accommodation in or near the old town for the night; staying inside Colonia rather than doing it as a day trip is what buys you the early-morning and late-evening light with none of the tour-bus crowds. For a full sense of what the neighbourhood holds beyond a single afternoon, the dedicated Colonia del Sacramento day-trip guide and the things to do in Colonia page both go deeper into individual sights.

For travellers who would rather have this leg organised end to end, with transport and a guide included instead of arranging the ferry independently, a private guided day in Colonia from Buenos Aires covers the crossing and a walking tour in one booking, though it returns the same day rather than overnighting.

Day 2: A full day in Colonia, at its own pace

This is the day a same-day ferry trip never gets to have. With the crowds gone by mid-morning and no return sailing to catch, a second day in Colonia is for the things that reward slowness: the small museums along the Calle del Comercio and around the Plaza Mayor, a proper sit-down lunch of Uruguayan parrilla rather than a rushed snack near the terminal, and the bastion walls and river views at the western tip of the peninsula at sunset, when the light comes in low off the water.

It’s also worth using part of the day to check practicalities for what comes next. Uruguay’s currency is the peso uruguayo, distinct from the Argentine peso, so if you haven’t already, sort out cash or confirm your cards work locally — ATMs are available in the old town and the newer part of Colonia. Also worth doing on this day: buy your bus ticket to Montevideo for the morning, either online in advance or at Colonia’s bus terminal a short walk from the historic centre.

Departures run several times a day, and while walk-up tickets are usually available outside peak weekends, booking ahead removes the uncertainty. The full mechanics of the crossing and onward travel, including which companies operate which leg, are laid out in the Colonia ferry guide.

Day 3: Overland to Montevideo

This is the leg that trips people up if they assume Uruguay works like a single connected system: it does not. The ferry company that brought you from Buenos Aires to Colonia has no role in the next stage. Getting from Colonia to Montevideo means a separate ticket on a Uruguayan long-distance bus operator, a comfortable coach ride of roughly two and a half hours along the coast road, arriving into Montevideo’s Tres Cruces terminal.

Once in Montevideo, the day is compact but real: the old town (Ciudad Vieja) with its own colonial-era core and the Plaza Independencia anchored by the Palacio Salvo, the 18 de Julio avenue running through the modern centre, and the long riverfront rambla if there’s time for a walk before catching transport back.

Montevideo is a working national capital rather than a preserved museum piece like Colonia, and it reads that way — busier, more everyday, with its own rhythm distinct from both Buenos Aires and Colonia. The Montevideo day-trip guide covers the compressed single-day version of this same city for travellers doing it without the Colonia stopover, and is useful even here for narrowing down what to prioritise in a single visit.

For the return to Buenos Aires, two options exist and neither connects automatically to anything already booked: a direct fast ferry from Montevideo to Puerto Madero, about two and a quarter hours, run separately from the Colonia route, or a short flight. Either way, this is again its own ticket, bought on its own schedule — the Montevideo ferry guide covers the direct crossing in detail, including how it differs from going back via Colonia.

Travellers who prefer to skip the independent legs entirely and do Montevideo as a single organised day from Buenos Aires, rather than this three-day version, can look at the Montevideo day trip with lunch and ferry included or the more streamlined Montevideo day trip from Buenos Aires, both of which bundle the crossing and a guided city visit into one purchase — useful for comparison even if you end up doing this itinerary independently.

Booking the three legs: what not to expect

It bears repeating because it’s the single most common assumption that causes a missed connection: there is no unified Argentina-Uruguay rail-and-ferry pass covering this route. Three operators, three bookings:

Leg	Typical operator type	Approx. duration
Puerto Madero → Colonia del Sacramento	Ferry company (Buquebus / Colonia Express)	~1 hour
Colonia del Sacramento → Montevideo	Uruguayan long-distance bus company	~2.5 hours
Montevideo → Buenos Aires	Ferry company (direct route) or airline	~2h15 ferry / ~1h flight

Each fare, each schedule and each booking confirmation is independent. Build in a little slack between the Day 2 evening in Colonia and the Day 3 bus departure, and again between arriving in Montevideo and any planned return sailing, rather than assuming tight same-day connections the way you might with a single integrated rail pass elsewhere.

For travellers weighing whether three days here is worth it against other ways to see the river crossing, the wider day trips from Buenos Aires overview sets this itinerary alongside the shorter Colonia-only version, and the Buenos Aires budget and currency guide is useful background before switching to Uruguayan pesos partway through the trip.

A four-day version that adds a cushion night back in Buenos Aires either side of the crossing is covered in the four-day Buenos Aires and Uruguay combo itinerary, and travellers who only want the Colonia half without continuing to Montevideo should look at the one-day Colonia ferry itinerary or the two-day Montevideo ferry itinerary instead.

Uruguay side trip FAQ: Colonia and Montevideo in three days

Can Colonia del Sacramento and Montevideo be combined on a single ticket?

No. The Buenos Aires-Colonia ferry, the Colonia-Montevideo bus and the Montevideo-Buenos Aires return leg are sold by separate operators, so each is booked individually rather than as one package.

Do I need my passport for this trip?

Yes. Uruguay is a separate sovereign country, and the ferry terminal at Puerto Madero and the Uruguayan side both run passport checks and immigration formalities, exactly as at an airport border crossing.

What currency should I bring?

Uruguay uses the Uruguayan peso (UYU), not the Argentine peso. Argentine pesos are not accepted as local currency once you land in Colonia, so plan to withdraw or exchange separately, or rely on cards.

How do I get from Colonia to Montevideo?

By local long-distance bus, roughly two and a half hours along the coast road, run by Uruguayan bus companies rather than the ferry operator, with several daily departures from Colonia’s bus terminal.

How do I get back to Buenos Aires from Montevideo?

Either a direct fast ferry from Montevideo to Puerto Madero, about two and a quarter hours, or a short flight; both are booked as their own separate leg, distinct from the outbound Colonia ferry.

Is three days enough for both towns?

It is enough to see both properly without rushing: a full day and a half for Colonia’s small colonial core, and one full day for central Montevideo, though a fourth day would ease the pace further.

Should I book the ferry and bus in advance?

In shoulder and high season, yes, especially the ferry, which has limited daily sailings and sells out on weekends; the Colonia-Montevideo bus generally has more frequent departures but booking a day ahead removes the risk.