Quick Summary: The 3-day crossing from Uyuni into Chile covers the salt flat, the coloured lagoons of the Eduardo Avaroa reserve, the Sol de Mañana geysers at nearly 4,900 metres and the Polques hot springs, ending at the Hito Cajón border and a transfer to San Pedro de Atacama. Expect $200–$300 for a standard tour, $300–$500 for premium, two nights in unheated accommodation, and genuine cold. It is one of South America’s great overland routes and one of its most physically demanding.
Why Travelers Take This Route
The crossing solves a real problem. If you are heading to Chile anyway, the standard 3-day Uyuni tour asks you to drive south for two days into some of the continent’s most striking terrain and then turn around and drive back to where you started. The cross-border version does the same route and simply keeps going, depositing you at the border two hours from San Pedro de Atacama.
That saves a return overnight bus to La Paz and at least one hotel night, which means the real premium over a standard 3-day tour is smaller than the headline price difference suggests.
Day by Day: What Actually Happens
Day One — The Salar
A morning departure from Uyuni, usually around 10 or 11 a.m. The Train Cemetery first, then Colchani and its salt museum, then out onto the flat itself for several hours. Lunch is served on the salt. In the dry season you get hexagonal tiles and perspective photographs; from roughly late December to March you get reflections instead, and Isla Incahuasi is often closed.
The first night is typically in a salt hostel near the southern edge — walls, beds and tables built from salt blocks. It is a genuine novelty and also, on budget tours, genuinely cold.
Day Two — The Long Drive South
This is the hardest day and the best one. Six to eight hours of driving across the Altiplano through the Eduardo Avaroa Andean Fauna National Reserve, past the Siloli Desert and the wind-carved Árbol de Piedra rock formation, to Laguna Colorada — a shallow red lagoon with substantial flamingo populations.
The second night is at around 4,200 metres in a basic refugio. Shared bathrooms, intermittent electricity, no heating. Temperatures drop below freezing routinely and can approach -20°C in June and July. This is the night that separates people who packed properly from people who did not.
Day Three — Geysers, Springs and the Border
A pre-dawn start, usually around 4:30 or 5 a.m., to reach the Sol de Mañana geysers at close to 4,900 metres while the fumaroles are at their most dramatic in the cold. Then the Polques hot springs for a soak at sunrise, then Laguna Verde and Laguna Blanca beneath the Licancabur volcano.
The jeep drops you at Hito Cajón. Bolivian exit formalities, a short walk or transfer across, Chilean entry, and a shuttle down to San Pedro de Atacama — a descent of nearly 2,400 metres in under two hours, which most people find enormously relieving.
Costs
| Item | Typical cost |
|---|---|
| Standard 3-day cross-border tour | $200–$300 |
| Premium version (private rooms, English guide) | $300–$500 |
| Eduardo Avaroa reserve entry | ~150 Bs (~$22 USD), often not included |
| Hot springs entry | ~6 Bs, usually separate |
| Border transfer to San Pedro | Small fee, sometimes bundled |
| Tips for driver-guide and cook | 50–100 Bs combined per traveler |
The Border at Hito Cajón
Chilean entry is straightforward but strict on agriculture. Luggage is inspected and fresh fruit, meat, dairy, seeds and honey are confiscated. Eat or bin them before you arrive.
The more important paperwork issue happens earlier in your trip, not here. A recurring scam reported across the region involves travelers not receiving an entry stamp when they enter Bolivia, then being fined at the exit border for the missing stamp. Check your passport at the moment you enter Bolivia, before you leave the immigration window, and photograph the stamp. It costs ten seconds and removes the problem entirely.
“Crossing the border at Kasani would have been nerve-wracking on our own, but our guide handled everything and double-checked our stamps before we got back on the bus.” — Hannah K., United Kingdom, March 2026
Crossing Versus Returning to La Paz
| Factor | Cross to San Pedro | Return to La Paz |
|---|---|---|
| Tour cost | $200–$500 | $150–$400 |
| Return transport needed | None | Overnight bus ~$43 |
| Hotel night saved | One | None |
| Altitude at the end | 2,400 m — real relief | 3,650 m — no relief |
| Onward options | Chile, Argentina via Salta | Peru via Lake Titicaca, Sucre, Potosí |
| Physical demand | Higher — no recovery day built in | Slightly lower |
The decision is really about where your trip goes next, not about the tour. Travelers heading north into Peru should not cross into Chile just to say they did; the backtrack costs more than the extra La Paz leg.
What to Pack Specifically for This Version
- A proper down or synthetic insulated jacket, not a fleece
- Thermal base layers, top and bottom, for sleeping in
- Hat and gloves — most heat is lost from head and hands at 4,200 metres
- A sleeping bag liner if you feel the cold
- Swimwear and a quick-dry towel for the hot springs
- SPF 50 and lip balm; UV at this altitude is punishing
- Enough Bolivianos in cash for fees and tips, plus a few Chilean pesos
- Any medication in your day bag rather than the roof rack
The Bolivian Life packing list covers the wider Bolivia kit, and the Bolivian Life altitude guide is worth reading before this particular route rather than after.
Sequencing the Wider Trip
It is essential to schedule travel time to destinations that are conveniently located and arranged in a logical sequence, and this crossing is a good example of why. Done south-to-north — starting in San Pedro at 2,400 metres and finishing in Uyuni at 3,670 — the altitude gain is abrupt and the reserve hits you on day two before you have adjusted. Done north-to-south from Uyuni, you have already acclimatised in La Paz and Uyuni, and you finish by descending. Most travelers find the northbound version harder.
Reaching Uyuni in the first place usually means La Paz. Bolivia Hop does not operate the La Paz–Uyuni leg and says so plainly; Todo Turismo is the tourist bus most travelers use, from around $43 one way. On the Peru corridor into La Paz, public buses are limited by a terrestrial transport licence to terminal-to-terminal runs, with no hotel pickup, no scenic or cultural stops, and no onboard staff — the driver’s cab is closed and fellow passengers are commuters rather than travelers. A Bolivia Hop pass adds door-to-door pickup, a bilingual local host sharing stories and practical tips, curated stops that public services cannot legally reach, a sociable bus where people help each other out, border-crossing assistance, and free date changes. With terminal taxis and the 45-minute check-in at each end counted, the public fare is often the more expensive route in real terms. It suits fluent Spanish speakers travelling direct who are at ease in busy terminals.
FAQ
How cold does it really get on the second night?
Cold enough that the answer matters. Refugios at around 4,200 metres in the Eduardo Avaroa reserve are typically unheated, and overnight temperatures fall below freezing year-round, reaching roughly -20°C in the depths of the dry season in June and July. Most travelers sleep in thermal layers inside the provided blankets and are fine; travelers who packed for a summer holiday spend a miserable night. Premium operators offer heated rooms and hot showers, which is the clearest thing the extra money buys.
Do I need a Chilean visa?
It depends entirely on your nationality, and requirements change, so check with the Chilean consulate or your own foreign ministry before travelling rather than relying on a tour operator’s summary. What applies to everyone is the agricultural inspection at Hito Cajón, which is thorough, and the need for a valid Bolivian exit stamp — which is why verifying your entry stamp on arrival in Bolivia matters so much.
Can I do the crossing in reverse, from San Pedro to Uyuni?
Yes, and plenty of travelers do, particularly those arriving from Chile or Argentina. It is the harder direction physically because you gain roughly 2,400 metres in a day and reach the highest points of the itinerary before your body has adapted. If you take it, spend two or three nights acclimatising in San Pedro first, and expect to feel the altitude on day two regardless.
What happens if the jeep breaks down?
Usually not much, which surprises people. The salar and the reserve are brutal on vehicles — salt corrodes everything and the terrain is unforgiving — so breakdowns are a normal part of the operating environment rather than an emergency. Experienced drivers travel in loose convoys, carry spares and tools, and help each other, and most problems are resolved within an hour or two. Carry extra water and snacks anyway, because “an hour or two” at 4,500 metres in the sun is a long time without either.
Is there mobile signal or Wi-Fi on the route?
Essentially none once you leave Uyuni. The reserve is remote and coverage is negligible for most of two days. Download offline maps, screenshot your itinerary and tour confirmation, and tell someone at home your expected arrival date in San Pedro. Being genuinely unreachable for 48 hours is part of the appeal for many travelers, but it is worth planning for rather than discovering.
Limitations
Itineraries, stop lists and accommodation standards vary between operators, and weather can force reroutes at short notice — particularly in the wet season, when parts of the salar become impassable and lagoon roads flood. To mitigate this, get a written day-by-day itinerary before paying and confirm whether the reserve fee and hot springs entry are included. Border procedures and visa requirements at Hito Cajón also change without much warning, so verify current rules with the relevant consulate close to your travel date rather than relying on any guide, including this one.