Houston to Sydney (Mascot)
17h 36mgate to gate
The flight from George Bush Intercontinental Airport (IAH) to Sydney Kingsford Smith International Airport (SYD) covers 13,836 km (8,597 miles) and takes approximately 17h 36m gate to gate for a typical jet.
The route heads south-west on an initial great-circle bearing of 247°, passing near 3.6° S, 150.2° W at its midpoint.
Bearing 247° south-west Midpoint 3.6° S, 150.2° W Model 805 km/h + 25 min
SOURCE·OurAirports + great-circle computation·REVIEWED JUL 2026
How this is worked out
- Take both airports' published coordinates from OurAirports — nothing here is scraped from another flight site.
- Great-circle distance by haversine on a mean earth radius of 6,371.0088 km: 13,836 km.
- Airborne time = that distance ÷ 805 km/h, a representative jet cruise speed: 17h 11m.
- Add a flat 25 minutes for pushback, taxi, climb, descent and taxi-in — the reason a 400 km hop is never half an hour: 17h 36m gate to gate.
- Winds, aircraft type and airline schedule padding are not modelled. The cruise-speed table shows how much that assumption is worth.
13,836 km / 805 km/h = 17h 11m airborne
+ 25 min ground = 17h 36m gate to gate
SOURCE·OurAirports + great-circle computation·REVIEWED JUL 2026
The same route, plotted on a world grid
The strip above gives the route its length and its shape. This gives it a position: latitude and longitude only, no coastlines, because a hand-drawn coastline would be decoration pretending to be data. On a flat grid the shortest path looks bent; on a globe it is straight.
Flight time at different cruise speeds
Aircraft type, winds and routing all move the real number. This is the same distance flown at different speeds, plus the 25-minute ground and climb allowance.
| Typical of | Cruise speed | Airborne | Gate to gate |
|---|---|---|---|
| Turboprop / regional | 550 km/h | 25h 09m | 25h 35m |
| Narrowbody jet (A320, 737) | 780 km/h | 17h 44m | 18h 09m |
| Widebody jet (777, 787, A350) | 900 km/h | 15h 22m | 15h 48m |
| Private jet (Gulfstream) | 850 km/h | 16h 17m | 16h 42m |
Headwinds on an eastbound long-haul routinely add 30–60 minutes; the same route westbound can be quicker. Airlines publish schedules with padding built in.
SOURCE·OurAirports + great-circle computation·REVIEWED JUL 2026
Both airports
| IAH | SYD | |
|---|---|---|
| Airport | George Bush Intercontinental Airport | Sydney Kingsford Smith International Airport |
| City | Houston | Sydney (Mascot) |
| Country | United States | Australia |
| ICAO | KIAH | YSSY |
| Coordinates | 29.9844, -95.3414 | -33.9461, 151.177 |
| Elevation | 97 ft | 21 ft |
Every figure on this plate is geometry. The shape of the earth is knowable; the airline's schedule is not.
Questions this plate answers
How long is the flight from Houston to Sydney (Mascot)?
A non-stop flight from Houston (IAH) to Sydney (Mascot) (SYD) takes about 17h 36m. The great-circle distance is 13,836 km (8,597 miles, 7,471 nautical miles), flying south-west on an initial bearing of 247°.
How far is Houston from Sydney (Mascot)?
13,836 kilometres in a straight line over the earth's surface — 8,597 miles or 7,471 nautical miles. Actual flown distance is usually 2–5% longer because aircraft follow airways, avoid weather and route around restricted airspace.
Is there a non-stop flight between IAH and SYD?
This page calculates the direct-line time and distance; it does not track airline schedules. At 13,836 km the route is within reach of long-range widebodies, though not every city pair is served non-stop. Check an airline or booking site for what is actually scheduled.
What should I expect on a 17h 36m flight?
Anything past six hours is a long-haul flight: expect at least one meal service, a significant time-zone shift, and enough sitting that circulation and hydration start to matter. Cabin altitude, dry air and disrupted sleep do more damage to a training routine than the flight itself.
Airport coordinates from OurAirports (public domain). Distance is a great-circle calculation; flight time uses the model described on the method page. Flight times are great-circle estimates for planning only — always check the airline's published schedule.
