Arriving at Leh Airport: Your First Hours at Altitude

Kushok Bakula Rimpochhe Airport in Leh sits at 3,256 metres above sea level — already higher than the summit of most European mountains. By the time you've walked to the terminal building, collected your bag, and stepped outside into the thin, bright air, you're at 3,500m. The descent from the aircraft takes less than a minute. Your cardiovascular system will spend the next 24–48 hours catching up.

What you do in these first hours matters more than anything else on your trip. Get it right and the rest of the week is fine. Rush it, and altitude sickness will flatten you.

What landing at altitude does to your body

At sea level, roughly 21% of the air you breathe is oxygen. At 3,500 metres, the percentage is the same — but the air pressure is lower, which means each breath delivers fewer oxygen molecules. Your body responds by breathing faster, your heart rate rises, and over the following hours and days, your kidneys adjust blood chemistry and your body gradually increases red blood cell production.

None of this is dangerous if you give it time. The problem is when people behave at 3,500m as they would at sea level: carrying heavy bags upstairs, going for a run, eating a heavy meal, staying out in the sun for hours. Each of these puts additional demand on a cardiovascular system that is already working harder than usual. The result is acute mountain sickness — AMS — which arrives not on landing but typically 6–12 hours later, often in the evening or overnight.

The full physiology, acclimatization timeline, and symptom guide is covered in our altitude acclimatization in Leh guide. This page focuses specifically on the airport arrival protocol — what to do in the hours immediately after landing.

The arrival protocol: slow down immediately

You don't need to do anything dramatic. You need to do less.

At the airport: move at half speed. Don't rush for bags, don't carry heavy luggage up stairs, don't stand in the sun unnecessarily. If someone offers to carry a bag, let them. The airport is small enough that you'll be through in under 30 minutes even moving slowly.

In the taxi to your accommodation: keep the window down for fresh air if you find it comfortable; the drive through Leh is itself a gentle introduction to the landscape. Don't check your phone obsessively. Just sit.

At your accommodation: check in, put your bags down, and lie down for 1–2 hours. Not because you're tired (you might not be), but because rest is the single most effective acclimatization intervention. Don't carry bags up multiple flights of stairs yourself. Most guesthouses in Leh are aware of this and will help.

First six hours: what to do, what to skip

Do

• Rest — lying down for at least an hour after arrival
• Drink water — 3–4 litres across the day, more than usual
• Eat something light — soup, bread, fruit; avoid heavy or oily food
• Walk very gently if you want fresh air — the Leh market is a 10-minute slow walk from most accommodation
• Sleep whenever you feel like it

Don't

• Exercise — no yoga, no runs, no gym
• Climb stairs more than necessary
• Drink alcohol — it suppresses the hypoxic ventilatory response and worsens altitude symptoms
• Take sleeping pills — they suppress breathing drive and can worsen overnight oxygen levels
• Drive to a higher-altitude destination (Nubra, Pangong) on your first day

Symptoms to expect — and which to watch carefully

Mild AMS symptoms in the first 24 hours are extremely common. They're not a sign that something is wrong — they're your body responding to a genuinely different environment. Expect some or all of: mild headache, fatigue, slight breathlessness on movement, disrupted sleep, and reduced appetite. These are not reasons to panic or descend.

The symptoms that require immediate attention are different in character: a headache that worsens despite rest and paracetamol, persistent vomiting, loss of coordination or balance, confusion or unusual mental slowness, and — most urgently — breathlessness at rest (not just on movement). These are signals of more serious altitude illness and warrant a doctor, not a wait-and-see approach. There is a medical facility in Leh for exactly this purpose, and your guesthouse will know where it is.

The overlap between normal symptoms and AMS can be confusing. The clearest distinguishing question: is it getting better or worse? Mild symptoms that are improving over 12–24 hours are normal acclimatization. Symptoms that are holding steady or worsening need attention. Read about acute mountain sickness symptoms in detail before you travel — not to become anxious, but to arrive informed.

Monitoring your SpO2 in Leh

A pulse oximeter — a small device that clips to your finger and measures blood oxygen saturation — is a useful addition to a Leh first-aid kit. Normal SpO2 at sea level is 95–100%. In Leh at rest, 80–90% is typical for the first day or two, climbing toward 85–95% as you acclimatize. These numbers alarm people because they're below normal — but at altitude, they're expected.

The more useful measure is trend: is your SpO2 improving as the hours pass, or declining? A reading that drops below 75–80% at rest is a concern. A reading that's low but stable and rising is just acclimatization in progress. Our guide to blood oxygen levels at altitude in Leh explains what the numbers mean and when to be concerned.

The first night — why sleep is rough and why that's normal

Almost everyone sleeps badly on their first night in Leh. This is not insomnia — it's a physiological response called periodic breathing, or Cheyne-Stokes breathing. During sleep, the respiratory drive that keeps you breathing steadily is partly suppressed, and at altitude, this creates a cycle of shallow breathing, a drop in oxygen levels, and then a deeper catch-up breath (or even a brief awakening) that restores things. You may wake multiple times. You may have vivid dreams. You may feel unrefreshed in the morning.

This improves dramatically on night two and three. By the end of day two in Leh, most visitors sleep substantially better. The full explanation of what altitude does to sleep quality is in our sleep at altitude guide. The short version: don't interpret poor first-night sleep as evidence that acclimatization is failing.

Day two in Leh — when you can start moving

By morning of day two, if your symptoms have been mild and are improving, you can begin gentle exploration. The Leh market, Shanti Stupa (a manageable climb that will test your lungs), and the old town are appropriate targets. Keep the pace gentle. Sit when you want to. Eat well.

Day three is typically when people feel genuinely well in Leh — and when longer excursions to higher-altitude areas like Nubra or Pangong become sensible. Don't accelerate this timeline because you feel fine on day two. The physiological adjustment is still happening beneath the surface, and ascending sharply to 4,000m+ before it's complete is how altitude sickness strikes people who felt perfectly well 12 hours earlier.