Three Weeks Overlanding from Rio to Buenos Aires: The Route I Actually Took

August 11, 2026 · First-person trip reports, not listicles

Generated (Gemini), via Wikimedia Commons

The route was Rio de Janeiro to Foz do Iguaçu by bus, a few days split between the Brazilian and Argentine sides of the falls, then a long run south through Argentina to Buenos Aires. No flights, no rental car. Just intercity buses, a couple of border crossings on foot, and three weeks that felt like the right amount of time, not rushed and not padded.

If you're planning something similar, here's the actual sequence, roughly what each leg cost in time, and where I'd change it if I did it again.

The route in outline

Before the day-by-day detail, here's the shape of the whole trip:

• Rio de Janeiro (3 nights)
• Overnight bus to Curitiba (1 night)
• Bus to Foz do Iguaçu (2-3 nights)
• Falls on both the Brazilian and Argentine sides, crossing into Puerto Iguazú
• Bus south through Posadas, then a long overnight run toward Rosario
• Rosario (1-2 nights)
• Short bus to Buenos Aires (4-5 nights, plus day trips)

That's about 20 to 21 days depending on how long you linger in Rio and Buenos Aires, which is where most people end up adding or cutting days.

Rio to Foz do Iguaçu

I gave Rio three full days, which was enough to see the main things and not feel like I was sprinting. From there it's an overnight bus to Curitiba, roughly 11 to 12 hours on a semi-cama or full-cama seat. Brazilian long-distance buses are comfortable by international standards, and the overnight ones usually have decent reclining seats, so this leg doubles as a night's sleep if you book it right.

Curitiba isn't a must-see, but it breaks the trip and gives you a shower and a bed before the next haul. From Curitiba to Foz do Iguaçu is another 9 to 10 hours by bus, run by a handful of companies that cover this corridor daily. Buy tickets a day or two ahead in high season; you don't need weeks of lead time on this route the way you might in Europe.

The falls, both sides

Foz do Iguaçu is really two towns and two national parks, one in Brazil and one across the border in Argentina at Puerto Iguazú. Most people do both sides, and it's worth it, they show you genuinely different views of the same falls. The Brazilian side is the panorama, one long afternoon covers it. The Argentine side is bigger and takes closer to a full day, with the walkways out over the Devil's Throat being the obvious highlight.

Crossing between the two is straightforward. Buses run between the bus terminals in Foz and Puerto Iguazú, and immigration on both sides is a short, ordinary stop if your passport and any required visa are in order. Check current entry requirements for your nationality before you go, since these do change and I won't pretend to know what applies to every passport.

Some travelers also duck into Ciudad del Este on the Paraguayan side for a few hours, mostly for the shopping and to say they've been. It's a legitimate option if you have a spare day, but I didn't build it into this itinerary and don't think it's essential.

Iguazú to Buenos Aires, the long haul south

This is the part people underestimate. Puerto Iguazú to Buenos Aires direct is close to 18 to 20 hours by bus. You can do it in one overnight run if you want to just get it over with, and plenty of people do. I broke it up instead, with a shorter hop to Posadas and then a longer overnight stretch toward Rosario, followed by a short final leg into Buenos Aires.

The logic was simple: two nights of decent sleep on buses beat one brutal one, and Rosario turned out to be a worthwhile stop on its own, not just a layover. It sits on the Paraná River with a proper riverside city feel, and a day there is enough to walk the main sights without needing more.

Argentine long-distance buses on this route range from basic semi-cama to full-cama with seats that go nearly flat. The price difference between classes is usually modest compared to the comfort gained, so if you're doing an overnight leg, it's generally worth paying up for the better seat class rather than saving a small amount and sleeping badly.

From Rosario to Buenos Aires is a short final push, around 4 hours, arriving into Retiro terminal, which is the main long-distance hub for the city and easy to get onward from by taxi or metro.

Buenos Aires and the tail end

I gave Buenos Aires five nights, which included a day trip out to Tigre and one to Colonia del Sacramento across the river in Uruguay by ferry. Both are easy half-day or full-day trips from the city and don't require any special planning beyond buying a ferry ticket in advance if you're going to Colonia on a weekend.

Three weeks total, door to door, felt right. Cutting the Rosario stop or doing Iguazú to Buenos Aires in one overnight jump would save two or three days if you're tighter on time, but you'd lose the breathing room that made the second half of the trip feel manageable rather than exhausting.

What I'd change

If I did this again, I'd add a night somewhere on the Rio to Curitiba leg rather than pushing straight through, since that overnight bus after a full Rio stay is the roughest sleep of the trip. I'd also give Foz do Iguaçu three nights instead of two, since rushing both sides of the falls into one and a half days undersells them.

I would not add Ciudad del Este unless you specifically want the shopping trip, and I would not try to compress the Iguazú to Buenos Aires stretch into one leg unless an overnight bus genuinely doesn't bother you.

Costs across the whole trip varied a lot by season and how far ahead I booked, so I'll give a range rather than a false number: budget roughly 40 to 70 USD a day for buses, basic accommodation, and food if you're traveling reasonably lean, more if you're upgrading bus classes or staying in nicer places in Buenos Aires. Treat that as a rough planning range, not a quote.

This is the kind of route Window Seat World tends to run, built from an actual trip rather than stitched together from other people's lists, and it's meant to be adjusted, not copied exactly. Swap towns, add or cut nights, but the backbone, Rio, Iguazú, the long run south, Buenos Aires, holds up as a real three-week overland trip.