Mendoza to Santiago: Bus, Plane and the Pass
How to get from Mendoza to Santiago, in both directions. The bus over Paso Los Libertadores, flying, why the border is the slow part, and winter closures.
There are two sensible ways from Mendoza to Santiago: a bus over the Andes, or a short flight over the same mountains. The bus is one of the great road journeys in South America. It is also, on a bad day, fourteen hours of your life. Both of those things are true and you should decide which one you are signing up for before you book.
The road climbs Ruta 7 west out of the vineyards, over the Paso Los Libertadores — the Cristo Redentor crossing — and drops into Chile. When the pass is clear and the border is quiet, count on something in the range of six to eight hours; when it is not, all bets are off. The flight is a little over an hour in the air, and the mountains look extraordinary from above too.
Bus or plane
| Bus | Plane | |
|---|---|---|
| Time | Roughly 6–8 hours when everything goes well, much longer when it does not | About an hour in the air, plus airports |
| Cost | Cheaper, usually by a lot | More, but not always dramatically so |
| The point | The crossing itself is the experience | Getting there |
| Risk | Border lines, weather, pass closures | Weather delays, but no closure risk |
| Best for | Anyone with a spare day and a window seat | Tight schedules, winter, families with small children |
My honest recommendation: take the bus once, in the direction where you have the loosest schedule, and fly the other way. Do not take the bus on the day you have an onward international flight. I have watched people do that and it is a bad hour at the airport.
The bus over Paso Los Libertadores
The route leaves Mendoza and follows the Río Mendoza gorge west, past the Potrerillos reservoir, through Uspallata, and up through the high valley where Aconcagua — 6,961 m (22,838 ft) — is visible from the road on the right. It is genuinely visible from a bus window, not a “you might glimpse it” situation, and it is the single best free view on the route. Further up, Puente del Inca and the old ski settlement at Penitentes go past, and then the road reaches the tunnel under the ridge.
On the Chilean side the road falls off the mountain in a stack of tight hairpins known as Los Caracoles — the snails. From above, the switchbacks look like someone dropped a ribbon down the slope. Sit on the left going into Chile for the best of it. After that the descent runs through a long valley, past reservoirs and vineyards, and the last stretch into Santiago is ordinary motorway.
Most companies run full-size coaches with reclining seats, and the higher classes recline further. Bring water, warm layers and something to eat. You are going over 3,000 m and buses get cold when they stop, which they will.
Why the border is the slow part
The crossing is not a wave-through. Everyone gets off the bus with their luggage, lines up at the control complex, gets stamped out of one country and into the other, and the bags go through a scanner. With one bus ahead of you this takes well under an hour. With six buses and a line of trucks ahead of you, it can take several hours, and there is nothing anyone on your bus can do about it.
Chile is serious about agricultural imports. Fresh fruit, vegetables, meat, dairy, seeds, honey — do not carry them across, and declare anything you are unsure about rather than being found with it. The fines are real. Eat your apple before the border, not after it.
Practical things that help: have your passport out and accessible, not buried in the hold. Keep your bus ticket. Do not pack your valuables in the checked bag. And use the bathroom at the complex, because the next stop is a long way down.
Winter, and when the pass closes
Between roughly June and September this is a high snow-covered mountain pass, and it closes. Sometimes for hours, sometimes for days. It can also close with no warning in a spring storm. Trucks back up on both sides and when it reopens the border backs up badly.
If you are traveling in the Argentine winter, three rules. Check the road status the same morning, not the night before. Do not plan a connection on either end that a closure would ruin. And if you have a fixed date to be in Santiago, fly. I say this as someone who loves that road. Winter here is covered from the Mendoza side in Mendoza in winter and the best time to visit.
Santiago to Mendoza: the same trip in reverse
Going east, the climb up Los Caracoles happens early in the day and the long descent into the Argentine vineyards comes at the end. The Aconcagua view arrives after the tunnel, so the anticipation is different but the scenery is identical. Border logic is the same. Sit on the right for Aconcagua going this way.
One extra note for the Santiago to Mendoza direction: arriving into Argentina, sort out how you are going to pay for things before you land. The rules for foreign cards and cash have changed repeatedly and the difference is not trivial. See money in Argentina.
Flying
Mendoza’s airport and Santiago’s are both small-to-medium and easy. The flight is short enough that the mountains fill the window almost the entire way. It is also the sane choice in winter and the only one I would trust with a same-day onward connection. Direct service does vary by season, so check before assuming it exists on your dates.
Once you get here
If Mendoza is the destination rather than the transit, start with things to do in Mendoza. If you are coming for the wine, which most people are, that is here. And decide where to base yourself with where to stay in Mendoza — it matters more than you would think.