KLAX to YSSY flight time is typically 14½–16 hours airborne. Learn how to plan the route, fuel, oceanic waypoints and step climbs.
A KLAX–YSSY simulator flight usually takes about 14½–16 hours airborne and roughly 15–17 hours gate to gate, depending mainly on Pacific winds, routing and aircraft. Plan around 6,500 nautical miles direct, then add the day’s oceanic route or coordinates, departure and arrival procedures, an alternate, reserves and step climbs.
This estimate applies to general flight simulation in Microsoft Flight Simulator, X-Plane, Prepar3D and FSX. Advanced airliner add-ons model wind, weight and engine performance more closely than simpler aircraft, so the same route can produce noticeably different times.
How long does KLAX to YSSY take?
Expect about 14½–16 hours from take-off at Los Angeles to landing at Sydney under ordinary long-haul conditions, although strong Pacific winds can push the flight outside that range.
| Measure | Planning figure | What changes it |
|---|---|---|
| Great-circle distance | About 6,500 nautical miles | This is the shortest geographical path, not necessarily the filed route. |
| Planned distance | Roughly 6,500–6,900 nautical miles | Oceanic routing, weather avoidance and departure or arrival procedures add distance. |
| Airborne time | About 14½–16 hours | Winds aloft, aircraft weight, cruise speed and routing dominate. |
| Gate-to-gate time | About 15–17 hours | Pushback, taxi, holding and arrival traffic add time. |
Do not divide distance by the aircraft’s advertised cruise speed and treat the result as the arrival time. That ignores taxi, climb, descent and changing groundspeed; our method for estimating flight time from distance, winds and aircraft performance explains the useful calculation.
Plan in UTC because the flight crosses the International Date Line. A westbound evening departure from Los Angeles can show a Sydney arrival two calendar dates later in local time, even though the elapsed flight time is only around 15 hours. Daylight-saving changes at either end also alter the local-time difference.
Which aircraft should you use?
Use a long-range widebody whose performance profile matches the exact simulated variant and payload. A 787, A350, long-range 777, 747 or A380-class aircraft can suit the sector; a short-haul airliner generally cannot complete it non-stop with credible payload and reserves.
Published maximum range alone is not enough. Check the expected take-off weight, fuel capacity, payload, headwind and alternate requirement. A profile for a different engine, airframe variant or add-on may calculate the wrong fuel burn even when the aircraft names look similar.
How do you plan a KLAX to YSSY simulator flight?
Build the flight around the chosen aircraft, forecast winds and valid navigation data rather than copying a fixed route from an old flight.
- Select the exact aircraft profile. Enter the correct airframe variant, engine option, passenger or cargo load and units. Confirm that the resulting take-off weight stays within the aircraft’s simulated limits.
- Generate the plan near the intended departure time. Pacific winds and preferred oceanic routing change, so a saved route is not a permanent best route. MSFS users can follow our practical SimBrief creation and import process; comparable planning principles apply to other simulators.
- Construct the route in sections. The basic shape is
KLAX – SID – continental or coastal fixes – oceanic entry – coordinates or oceanic fixes – Australian landfall – STAR – YSSY. Let the actual wind and runway assignment determine the SID and STAR instead of hard-coding procedures from somebody else’s route. - Plan the oceanic portion carefully. Verify every latitude and longitude, including north/south and east/west designators. For realistic position management, diversions and route consistency, use our explanation of Pacific oceanic procedures and coordinate handling.
- Choose an initial cruise level and step climbs. A heavily loaded widebody may need to begin in the upper FL200s or lower FL300s, then climb as fuel burns off. Use the level calculated for that aircraft and flight; many add-on FMCs predict step-climb points but still require the pilot to initiate them.
- Select suitable alternates. Check weather, runway length and aircraft support rather than choosing the nearest airport blindly. The destination alternate and ETOPS/EDTO en-route diversion airports serve different purposes and may require separate fuel allowances.
- Load fuel and payload once. Use either the aircraft’s EFB/loading system or the simulator’s weight interface as directed by the add-on. Using both can overwrite the dispatch values or load the same payload twice.
- Audit the imported route. Compare the planner, simulator map and FMC leg by leg. Check the first oceanic coordinate, date line crossing, final oceanic coordinate, destination procedure, total distance, initial altitude and predicted fuel on arrival before pushback.
- Monitor progress during cruise. Compare actual fuel remaining with the operational plan at regular waypoints. Reassess the destination weather before descent, update the runway and STAR if required, and return time acceleration to normal well before the top of descent.
How much fuel does KLAX to YSSY require?
There is no reliable aircraft-independent fuel figure for KLAX to YSSY. Calculate block fuel from the exact airframe, route, winds, payload and alternates using taxi + trip + contingency + alternate + final reserve + extra fuel.
A mistake we see constantly is filling every tank to maximum. Unneeded fuel increases take-off weight and fuel burn and can push the aircraft above structural or performance limits. Use the planner’s block-fuel figure, then verify each component with our block-fuel, reserve and simulator loading guidance.
Keep fuel and mass units consistent. Confusing kilograms with pounds creates a plan that may appear to load normally but leaves the aircraft dramatically underfuelled or overweight.
Why does the FMS reject the oceanic route?
Most KLAX–YSSY route failures come from incompatible coordinate formats, mismatched navigation-data cycles or an unresolved route discontinuity.
- Coordinate format: the planner, simulator and FMS may encode latitude/longitude waypoints differently. Import the format intended for that aircraft instead of manually shortening coordinates, then inspect their positions on the map.
- Navigation-data mismatch: an airway, fix, SID or STAR from one cycle may not exist in another. Regenerate against matching data where possible, or replace the unavailable segment with valid common fixes.
- Discontinuities: clear one only after confirming which legs it should connect. A deliberate vector segment near an airport is not the same as a broken oceanic route.
- Runway changes: replacing a runway or STAR can duplicate waypoints or create a turn back towards the previous fix. Review the modified legs rather than activating the approach immediately.
- Conflicting master plans: avoid editing the world-map route and FMC independently. Choose one plan as the master, import it, and reconcile every difference before departure.