London to Delhi: what the LHR to DEL corridor looks like
- Departure
- London Heathrow Airport, London, the United Kingdom
- Arrival
- Indira Gandhi International Airport, Delhi, India
- Great-circle distance
- 6,731 km (3,634 nm)
- Typical airborne time
- 8h 20m
- Usual cruise levels
- FL340 to FL400
- Initial track
- eastbound
Route overview
The LHR to DEL sector connects London Heathrow Airport in London, the United Kingdom, with Indira Gandhi International Airport in Delhi, India. Measured along the great circle the two airports are 6,731 km apart, roughly 3,634 nautical miles, which is close to 8h 20m in the air before winds and routing are taken into account. The initial track is eastbound, and the middle of the route sits in mid latitude latitudes.
Monsoon season convection
Along the way the track passes over high latitude airspace where the polar jet stream lives. This corridor is shaped by the monsoon cycle. In the wet months convective cells cluster along the coastal section of the track, and the crew works around them with radar. In the dry months the cruise is generally smooth, with light movement limited to climb and descent.
Cruise altitudes on this sector
Long haul crews normally start cruise around FL340, then step climb toward FL380 or FL400 as the aircraft burns off fuel and can hold a higher level. Choice of level matters because turbulence is layered: a change of two or three thousand feet often puts the aircraft into calmer air, and that is one of the first adjustments a crew will request.
Seasonal pattern
June to September is the monsoon window and the most convective part of the year on this corridor. October to May is normally quiet at cruise level.
Flying this route with less worry
It is worth remembering that turbulence of the kind found on the LHR to DEL track is uncomfortable and entirely within what the aircraft is built for. Wings are designed to flex, the flight is planned around the forecast, and the crew adjusts level or track when it helps. The live forecast above shows the current picture for this corridor so there are fewer surprises on the day.