Short answer: Gangtok to Leh is 2,400 km by road across five states (West Bengal, Bihar, Uttar Pradesh, Delhi/Haryana, Punjab, Himachal, J&K, Ladakh, or the Assam-Delhi-Manali route which is worse). No one drives it. The flight route is Bagdogra to Delhi to Leh, two separate connections. A combined Sikkim + Ladakh trip in a single visit is possible but almost always the wrong call. Different permits, different altitude curves, different peak seasons, and enough drive-and-flight time to eat 3-4 days of your holiday just moving. The honest recommendation: do them on separate trips, or pick one for this trip and sequence the other later.
The actual distance and time
- Gangtok (Sikkim) to Leh (Ladakh) by road: 2,400 km. Shortest sensible route via Siliguri-Delhi-Manali-Leh takes 5-7 days one way, depending on stops and Manali-Leh road status (only open mid-June to early October).
- By flight: Bagdogra (BDG) to Delhi (DEL) 2 hours + Delhi to Leh (IXL) 1.5 hours + 3-4 hour connection = 8-10 hours door to door. Cost ₹15,000 to ₹25,000 per person one-way in peak season.
- The straight-line distance is 1,850 km but no direct road or flight exists.
- By train: no direct route. Would require multiple changes across NJP, Delhi, Kalka, Manali. Not a serious option.
Why combining Sikkim and Ladakh in one trip usually fails
Four practical reasons. First, permits. Sikkim needs an Inner Line Permit (foreigners) or Restricted Area Permit for North Sikkim; Ladakh has its own separate Inner Line Permit system (Nubra, Pangong, Tso Moriri each need their own permit endorsements). No single agency processes both. You end up coordinating two DMCs, one in Gangtok and one in Leh. Second, altitude. Both regions push you above 4,000m within 48-72 hours of arrival. Back-to-back high-altitude exposure without a low-altitude reset in between is the classic route to serious altitude sickness. Third, peak seasons differ. Sikkim peaks in October to November (post-monsoon clarity) and March to May (rhododendron and pre-monsoon). Ladakh peaks in June to September (Manali-Leh road open, Pangong dry). The overlap window is narrow (September) and shoulder-quality for both. Fourth, travel days. To do a proper Sikkim trip plus a proper Ladakh trip inside 15 days, you spend 3-4 days just in transit airports and drives, which leaves 11-12 days of actual holiday split between two regions that each deserve 7+ days.
If you still want to combine them
The one shape that works is a 15-16 day trip in September (the overlap month), sequenced as Ladakh first then Sikkim. Ladakh first because the Manali-Leh road closes in early October and you want the road option for the acclimatisation drive. Land in Delhi, take the Manali-Leh road up (3-4 days with proper acclimatisation stops at Manali, Jispa, Sarchu), do 5-6 days in Ladakh (Leh, Nubra, Pangong), fly Leh to Delhi to Bagdogra (one day in transit), then 6-7 days in Sikkim (Gangtok, Lachung, Pelling). Total 16 days, minimum ₹1.5 to ₹2.5 lakh per person all-in. This is the only sensible combined shape we have ever quoted, and honestly most guests who ask about it end up booking one region and sequencing the other for a future trip.
Which should you pick for this trip
Pick Sikkim if this is your first high-altitude trip or if either traveller has any altitude concern. Sikkim's altitude ladder is gentler (Gangtok 1,650m, Lachung 2,750m, Yumthang 3,564m as the top for most trips) and the region has better medical infrastructure. Pick Sikkim if you want variety in landscape (tea gardens + monasteries + alpine valleys + Kanchenjunga views all in 6-7 days). Pick Ladakh if you have prior high-altitude experience, want the lunar-desert landscape, are travelling in June to September specifically, and are willing to commit 8-10 days minimum (Ladakh does not work as a short trip because you need 2-3 days just for altitude acclimatisation in Leh before going anywhere).
Cost comparison for equivalent trips
- 7-night Sikkim trip (Gangtok + North Sikkim + Pelling), 3-star mid-tier, per person twin sharing: ₹42,000 to ₹58,000 on ground (excluding flights)
- 7-night Ladakh trip (Leh + Nubra + Pangong), 3-star mid-tier, per person twin sharing: ₹55,000 to ₹75,000 on ground (excluding flights). Higher because of oxygen supplementation costs, fewer road-accessible days, more expensive permits.
- 15-day combined trip via Delhi: ₹1,50,000 to ₹2,50,000 per person all-in. Not linearly cheaper than doing them separately across two trips.
- Two separate trips (7-night Sikkim in November + 8-night Ladakh next June): ₹1,15,000 to ₹1,60,000 per person total. Actually cheaper than the combined 15-day version, and each region gets its full attention.
