Delhi to Leh flights in 2026: Air India vs IndiGo, cheapest season, and what the altitude window actually means for your travel dates
By Diya Verma (Diya Verma flies from Tier-2 Indian cities and chases every possible fare hack — reposition flights, hidden-city ticketing, mileage runs and OTA bundle tricks. She has booked 200+ international trips out of Lucknow, Indore and Jaipur.) · Published · 12 min read
DEL–IXL (Delhi to Leh) is one of India's most spectacular — and most unusual — domestic routes. Air India consistently beats IndiGo on many fare dates here, which surprises people used to LCC pricing logic. Add in a very tight seasonal flying window and altitude sickness timing, and the 'when do I book and which airline' question is more interesting than it looks.
TL;DR — the short answer
Air India often has lower all-in fares on DEL–IXL compared to IndiGo, particularly on routes where Air India's economy fares include 15 kg checked baggage. The cheapest months to fly Leh are April–early May (before peak season) and September–early October (just after). June and July are peak, with fares 60–100% above the annual baseline. January–March, the airport is typically closed or operates only in military/limited capacity — you cannot fly to Leh in winter as a civilian.
Wait — Air India is cheaper than IndiGo on this route?
I know — counterintuitive. The assumption is always that LCCs are cheapest. On most domestic routes, IndiGo's base fares undercut Air India. DEL–IXL is a notable exception on many dates, and the reason is worth understanding:
Delhi–Leh is a thin route — low seat count, limited frequency, significant operational complexity (high-altitude airport, weather constraints, military coordination). Air India has operated this route for decades and has a structural presence at IXL. It also holds slots that were historically protected under government route obligations. The result is that Air India prices DEL–IXL competitively because the route carries strategic importance and because it's genuinely competing for the same demand pool IndiGo targets.
More importantly: Air India's standard economy fares (not the cheapest bucket) typically include 15 kg checked baggage. IndiGo's base fares include nothing. Once you add a bag to IndiGo, the total can exceed Air India's all-in fare. Check both airlines' booking flows with your bag requirement — the number that matters is the total, not the headline base fare.
That said, fares on this route move a lot. I've seen IndiGo be cheaper on specific dates by ₹1,500–₹2,000 even after bags — particularly when IndiGo runs flash sales. Use FlightGPT to check both side by side for your travel date rather than assuming one is always cheaper.
The seasonal window: when is the airport actually open?
Leh's Kushok Bakula Rimpochhe Airport (IXL) sits at about 3,256 metres (10,682 feet) above sea level. It operates year-round officially, but civilian commercial flights effectively run from approximately late March or April through late October or November, depending on snowfall and weather conditions.
The practical timeline:
- January–mid-March: Flights operate sporadically and are frequently cancelled due to snow and ice. Not a reliable window for civilian travel. Road access (Manali–Leh highway) is also closed. Leh in deep winter is genuinely inaccessible for most people.
- Late March–April: Flights resume more regularly. Roads are still closed or just opening. Leh is quiet, cold, and beautiful. Fares are lower — this is the early shoulder season.
- May: Tourist season ramps up. The Manali–Leh and Srinagar–Leh highways typically open in May, giving travellers road alternatives. Fares start climbing toward the June peak.
- June–August: Peak season. Fares are highest — typically 60–100% above April levels. Weather is ideal for trekking and Pangong. Every guesthouse is full. Book 8–10 weeks ahead for this window.
- September–October: My favourite window. Weather is still clear, tourist crowds thin dramatically after mid-September, fares drop 30–50% from the July peak, and the light at Pangong in October is extraordinary. High passes may close to vehicles in late October after snowfall, but flights continue.
- November–December: Flights become intermittent again and eventually stop or reduce to minimal frequency. Not a window most travellers should plan around.
Altitude sickness and your travel date choice
Here's something that doesn't show up in fare comparisons but matters: altitude sickness at Leh is real, and your travel date can affect how badly it hits you.
Leh is at 3,500 metres. Flying in (vs. driving) means you gain that altitude in about an hour — your body has no gradual acclimatisation window. Almost everyone who flies directly to Leh from Delhi experiences some symptoms: headaches, fatigue, shortness of breath, sometimes nausea. Most resolve in 24–48 hours with rest, hydration, and not doing much on the first day.
A few things affect severity:
- Early season (April): Air is thinner (lower oxygen partial pressure in cold air). AMS (acute mountain sickness) can be slightly more pronounced in April than in June for some people. That said, hundreds of travellers fly in April without severe symptoms.
- Your fitness level matters less than you'd think: AMS does not correlate with how fit you are. Very fit trekkers get it; unfit retirees don't. The main risk factor is ascent speed — and flying in is always fast.
- Diamox (acetazolamide): Many travel medicine specialists recommend starting it 24–48 hours before arriving at altitude. Talk to a doctor before your trip — it's prescription-only and not appropriate for everyone. This is general travel information, not medical advice.
- Rest on day one, non-negotiable: Whatever your arrival month, your first 24 hours in Leh should be rest, hydration, and light food. Don't try to hike to Khardung La on day one — it's a well-known tourist mistake that ends in medical evacuations.
How to actually book DEL–IXL and what to watch out for
A few things that catch people off guard on this specific route:
- Cancellations and delays are common: DEL–IXL flights are subject to weather holds more than almost any other Indian domestic route. Fog in Delhi in winter, cloud cover over the mountains, military airspace activity — all can delay or cancel flights. Do not book a connecting international flight out of Delhi on the same day as your Leh return, without significant buffer (ideally the day after). I learned this the expensive way.
- Booking class matters for baggage: On Air India, the cheapest 'Economy Lite' buckets may not include checked bags. The mid-tier economy class does. Check the fare rules before booking — the baggage inclusion is listed in the fare conditions. On IndiGo, add the bag explicitly at booking.
- Early morning flights are usually more reliable: Both Air India and IndiGo tend to schedule Leh flights in the morning — visibility is better and mountain thermals are calmer in the early hours. Afternoon departures on this route carry a slightly higher delay/cancel risk. Always pick the early flight if you have a choice.
- Return flight — book it even if you're returning by road: If you're planning to drive back via the Manali–Leh highway, still book and hold a return flight as backup. Roads can close unexpectedly. A flight you cancel because you drove back is much cheaper than being stranded because the road closed and all flights are full.
Check fares on FlightGPT for both carriers and all date options. The routes section has DEL–IXL historical fare data. For Leh–Ladakh travel itineraries, visa requirements (foreign nationals need an Inner Line Permit) and local logistics, the destinations page is a good starting point.
Bottom line
Delhi to Leh is not a route where the LCC default assumption holds. Check Air India with bags included against IndiGo with bags — Air India wins on total cost on more dates than you'd expect. Book the morning flight. Travel in April or September–October if fares matter to you and you can handle the shoulder-season crowd levels (which, honestly, are better). Take altitude sickness seriously on day one regardless of your fitness level. And always book a return flight as an insurance policy even if you plan to drive out. Leh is worth every rupee of the fare — just make sure the rupee count is accurate before you hit confirm.
Frequently asked questions
Is Air India cheaper than IndiGo on Delhi–Leh?
On many dates, yes — once you factor in checked baggage. Air India's mid-tier economy fares on DEL–IXL include 15 kg checked baggage, while IndiGo's base fares include nothing. When you add the IndiGo bag cost, the total often meets or exceeds Air India's fare. Check both in parallel on FlightGPT or their own websites for your specific travel date.
What are the cheapest months to fly Delhi to Leh?
April–early May and September–early October are the lowest-fare windows. June–August (peak tourist season) sees fares 60–100% higher than shoulder months. January–March, commercial flights to Leh are either suspended or highly unreliable due to winter weather — don't plan travel around them.
Is the Leh airport open in January and February?
Technically yes, but civilian commercial flights are minimal and unreliable in deep winter. Snow, ice, and low visibility cause frequent cancellations. The Manali–Leh and Srinagar–Leh highways are also closed in this period. Leh is not practically accessible for civilian tourists in January–February by most transport modes.
How bad is altitude sickness when flying to Leh?
Almost everyone experiences some symptoms in the first 24–48 hours — headache, fatigue, shortness of breath are typical. Severe AMS is less common but can happen. The standard advice is to rest on day one, drink plenty of water, avoid alcohol, and not ascend further until you've acclimatised. Talk to a travel medicine doctor about Diamox (acetazolamide) before your trip — it's prescription-only and not suitable for everyone.
Can I book a Leh return flight and not use it if I drive back?
Yes — and this is recommended as a backup. Manali–Leh road can close suddenly due to landslides or snow, even in season. A refundable or lightly-penalised return flight is a safety net worth having. Check the cancellation policy at booking — Air India and IndiGo both have fare classes with full or partial refunds if cancelled 24 hours or more before departure.
Are morning or afternoon flights better for Delhi–Leh?
Morning flights are generally more reliable on this route. Visibility is better, mountain thermals are calmer in the early hours, and if there's a weather delay, you have more of the day to work with. Both Air India and IndiGo tend to schedule Leh services in the morning — pick the earliest flight available.