JQ109 turbulence forecast
Jetstar · Bali/Denpasar (DPS) to Perth (PER)
Next departure at its usual time · Mon 9 Nov, 11:45 Bali/Denpasar time
This date's schedule isn't confirmed yet. This is the air JQ109 flies through if it leaves at its usual time.
Smooth most of the way, with occasional light bumps on descent. Barely moves your drink.
- Bumpiest stretch
- Light
- Flight time
- 3h 35m
- Distance
- 2,583 km
- Cruise altitude
- 37,000 ft
- Aircraft
- Airbus A320 family
Bumpiness along the flight
Takeoff on the left, landing on the right. The higher the line, the bumpier the air the forecast expects at that moment.
Where, and why
The flight split into stretches: how bumpy each is forecast to be, and what causes it.
Cruise0m – 3h 22mSmooth
Nothing significant forecast here.
At cruise the air is thin and cold, and most of it is calm. The bumps up here come from the jet stream, a band of fast wind whose edges stir the air, or from waves set off by mountains far below. This forecast shows where those edges are.
Descent into Perth3h 22m – 3h 35mLight
Daytime thermals
Sun-warmed ground sends bubbles of warm air upwards, and flying through them feels like a car on a gently rutted road. They stay in the lowest few thousand feet, so you only meet them for a few minutes after takeoff or before landing. At cruise height you're far above them.
Coming down means flying back through the low, lively air near the ground: afternoon thermals, gusts around the airport. It is the busiest part of the flight for the crew, and the part they train for most.
This forecast changes. FlyBud tells you when.
A new weather model run lands every few hours. Add JQ109 in FlyBud and you get the full turbulence map along your route, a push when the forecast for your flight changes, live tracking and your flight on the lock screen.
Flight status
The latest JQ109 flight on our records, as the airline last reported it.
Last update 7 days ago
Gate changes, delays and the baggage belt, pushed to your phone as they happen.
The aircraft
What JQ109 is flown with, and how it handles bumpy air.
Airbus A321 NEO
- Type code
- A21N
- Seats on this flight
- 232
- First flew
- 1987
- In service since
- 1988
- Economy seating
- 3-3
- Engines
- 2
- Cabin pressure equal to
- 8,000 ft
Bigger and heavier aircraft are moved less by the same patch of air, and every airliner is designed for much stronger turbulence than it will meet.
The airline
The route
Bali/Denpasar (DPS) → Perth (PER)
- Distance
- 2,583 km
- Flight time
- 3h 35m
- Usual departure
- 11:45 local
- Usual arrival
- 15:20 local
Recent JQ109 flights
The forecast each flight carried, and how it ran.
| Date | Aircraft | Forecast | How it ran |
|---|---|---|---|
| Fri 30 Oct | A320 | Smooth | On time |
What each level feels like
- Smooth
- Calm air. Nothing to notice beyond the hum of the engines.
- Light
- Gentle ripples and the odd dip. Drinks stay put, and walking to the toilet is fine.
- Moderate
- Clear bumps. Drinks may slosh and the belt sign comes on. Uncomfortable, but the pilots stay in full control.
- Severe
- Strong jolts, and loose items can move. This is rare, and it's why the belt sign exists. Crews slow down and change altitude to get out of it.
How this forecast is made
The planned route is sampled from gate to gate at the altitude the aircraft flies, through a global weather model, and corrected with turbulence reports radioed in by pilots in the last few hours. Each new model run replaces the forecast.
Planned route · timing and conditions may change.
Why turbulence isn't dangerous
Aircraft are designed for much worse.
Airliners are tested to loads well beyond anything turbulence produces. The wings are meant to flex, so seeing them move is normal.
Crews know where it is.
Your crew has forecasts like this one, live reports from other pilots and their own weather radar, and they change altitude to stay out of bumpy air.
Keep your belt on.
Almost all turbulence injuries happen to people who are standing or not buckled in. Seated with your belt on, turbulence is uncomfortable but not dangerous.
Questions about JQ109
Will JQ109 be bumpy?
For the flight on Mon 9 Nov: Smooth most of the way, with occasional light bumps on descent. Barely moves your drink. The forecast is replaced with every new weather model run, so check back closer to departure.
What plane flies JQ109?
Recently JQ109 has been flown with: Airbus A320 family. Airlines can swap the aircraft until shortly before departure.
How long is JQ109?
About 3h 35m gate to gate from Bali/Denpasar to Perth, a distance of about 2,583 km.
What time does JQ109 leave?
JQ109 usually departs Bali/Denpasar at 11:45 local time and arrives in Perth at 15:20 local time. Times change; the app tracks the live schedule.
Is turbulence dangerous on JQ109?
Turbulence is uncomfortable, not dangerous to the aircraft. Airliners are certified for loads far beyond anything turbulence produces, and crews plan around the bumpy patches with the same kind of forecast as this one. Injuries are almost always to people who were standing or unbuckled, so keep your seatbelt fastened whenever you're seated.
How accurate is this turbulence forecast?
It is a forecast, so it is best within a day or so of departure and improves with every model run. The bumpy patches it finds are usually in the right place, but their timing can shift by a few minutes and the crew may change altitude to avoid them, so the ride you get is often smoother than the forecast.
Fly JQ109 knowing what's ahead
The turbulence forecast for your exact flight, live tracking, delay alerts and arrival weather. Built for people who'd rather know.