Altitude sickness doesn't need a mountain, just a flight to Cusco

World Destinations Altitude illness starts around 2,450 m, and Cusco, La Paz and Lhasa all sit above it. Flying straight in is harder on you than walking to Everest… By Dawa Sherpa · Sep 5, 2026 Read the full story

Altitude illness starts at a sleeping altitude of about 2,450 m (8,000 ft), and sometimes lower. Cusco is roughly 3,350 m (11,000 ft). La Paz is about 3,650 m (12,000 ft). Lhasa is about 3,700 m (12,100 ft). None of those is a mountain. All three are places… Travel Himalaya Nepal · News

Why a city can do what a mountain does

Altitude illness is caused by the rate you arrive, not by how hard you worked to get there. Air pressure falls as you go up, so each breath carries less oxygen, and your body needs days — not hours — to respond. A flight compresses that adjustment into… Travel Himalaya Nepal · News

The 50% number, and what it is actually saying

Where travellers reach above 3,400 m by air, rates of altitude illness approach 50% . That is not a warning about mountaineering. It is a description of ordinary tourism — the Sacred Valley, the Altiplano, a Tibet tour that begins at the airport. Travel Himalaya Nepal · News

Fitness is not the variable

Training and physical fitness do not affect the risk. That is the guidance, stated plainly, and it is the single most useful sentence in this piece. I have watched it play out for years in the Khumbu. Strong walkers get sick and slow ones do not. The… Travel Himalaya Nepal · News

What to actually do

The fix is boring, which is why it works. Where the geography allows it, sleep lower than the airport for one or two nights before going up — at Cusco and La Paz you can drop into a valley below the arrival altitude, and doing so may remove the need for… Travel Himalaya Nepal · News

Where this leaves a Nepal trip

Nepal has the same physics and a better profile, because you mostly walk into it. Kathmandu sits at about 1,400 m, low enough to be irrelevant, and a well-built itinerary then spends days doing what a flight to Cusco refuses to do. The trade is time. Our… Travel Himalaya Nepal · News

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