How turbulent is BOM-DEL typically?

Smooth outside monsoon season; short convective bumps between June and September.

What is the best altitude to avoid turbulence on BOM-DEL?

Cruise at FL350 or above and deviate around cells. Monsoon storm tops are high, so lateral avoidance does most of the work.

When is the best time of year to fly BOM-DEL?

October to May, outside the monsoon. Flights between June and September see the most convective activity.

What causes the turbulence on this route?

Monsoon thunderstorms and the strong vertical air movement inside and around them.

Turbulence forecast BOM → DEL. Mumbai to Delhi. SkyBriefing.

Mumbai to Delhi: what the BOM to DEL corridor looks like

Departure: Chhatrapati Shivaji Maharaj International Airport, Mumbai, India
Arrival: Indira Gandhi International Airport, Delhi, India
Great-circle distance: 1,137 km (614 nm)
Typical airborne time: 1h 49m
Usual cruise levels: FL280 to FL360
Initial track: northbound

Route overview

The BOM to DEL sector connects Chhatrapati Shivaji Maharaj International Airport in Mumbai, India, with Indira Gandhi International Airport in Delhi, India. Measured along the great circle the two airports are 1,137 km apart, roughly 614 nautical miles, which is close to 1h 49m in the air before winds and routing are taken into account. The initial track is northbound, and the middle of the route sits in tropical latitudes.

Leaving Mumbai

Mumbai sits between the Arabian Sea and the Western Ghats, and the climb out turns over water within a minute or two. During the monsoon the departure is flown through layers of moist, unstable air, which is why the seat belt sign stays on longer here. The great-circle track leaves BOM northbound, and the first waypoint band of the flight sits close to 21.5N 73.9E. On a sector of 1h 49m, the climb to cruise takes roughly the first twenty to twenty five minutes.

Monsoon season convection

The midpoint of the BOM to DEL track lies near 23.8N 75.0E, about 569 km from Mumbai, which is where the corridor spends its longest continuous stretch at cruise level. 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

Short sectors like this one spend a large share of the flight climbing and descending, so cruise is brief and usually sits in the FL280 to FL360 band. 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.

Arriving into Delhi

Arrivals into Delhi descend across flat plain terrain. In the pre monsoon months dust laden thermals reach several thousand feet, which is the usual explanation for the bumps on the last part of the descent. Descent normally begins around 26.2N 76.0E, roughly 284 km before DEL, and takes about half an hour from cruise level to touchdown.

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 BOM 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.