Boston to Sydney (Mascot)
20h 36mgate to gate
The flight from Boston Logan International Airport (BOS) to Sydney Kingsford Smith International Airport (SYD) covers 16,251 km (10,098 miles) and takes approximately 20h 36m gate to gate for a typical jet.
The route heads west on an initial great-circle bearing of 270°, passing near 11.4° N, 148.4° W at its midpoint.
Bearing 270° west Midpoint 11.4° N, 148.4° 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: 16,251 km.
- Airborne time = that distance ÷ 805 km/h, a representative jet cruise speed: 20h 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: 20h 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.
16,251 km / 805 km/h = 20h 11m airborne
+ 25 min ground = 20h 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 | 29h 33m | 29h 58m |
| Narrowbody jet (A320, 737) | 780 km/h | 20h 50m | 21h 15m |
| Widebody jet (777, 787, A350) | 900 km/h | 18h 03m | 18h 29m |
| Private jet (Gulfstream) | 850 km/h | 19h 07m | 19h 32m |
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
| BOS | SYD | |
|---|---|---|
| Airport | Boston Logan International Airport | Sydney Kingsford Smith International Airport |
| City | Boston | Sydney (Mascot) |
| Country | United States | Australia |
| ICAO | KBOS | YSSY |
| Coordinates | 42.362, -71.0079 | -33.9461, 151.177 |
| Elevation | 20 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 Boston to Sydney (Mascot)?
A non-stop flight from Boston (BOS) to Sydney (Mascot) (SYD) takes about 20h 36m. The great-circle distance is 16,251 km (10,098 miles, 8,775 nautical miles), flying west on an initial bearing of 270°.
How far is Boston from Sydney (Mascot)?
16,251 kilometres in a straight line over the earth's surface — 10,098 miles or 8,775 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 BOS and SYD?
This page calculates the direct-line time and distance; it does not track airline schedules. At 16,251 km the route is at the extreme end of what any airliner can fly non-stop, so a connection is likely. Check an airline or booking site for what is actually scheduled.
What should I expect on a 20h 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.
