United AirlinesUA100% on time
Flights UA101 21:25 daily
live
Direct flights from Houston (IAH) to Sydney (SYD): 7 nonstop departures observed each week across 1 airline. 100% of the last 6 tracked flights arrived within 15 minutes of schedule. The median arrival is 9 minutes early. No cancellations were recorded across the 7 tracked flights. The nonstop covers 13,836 km, an estimated 18 hours 14 minutes in the air. Measured by Pro Flight Search from live flight boards at Houston and Sydney. Updated 1 November 2026 at 06:22 UTC.
Today, IAH → SYD
Sun 1 Nov · local times- 20:25 UA101United Airlines Sched 20:25Departure not confirmed by the board ·
Checked IAH board 01:22 · SYD board 17:07
IAH
Houston
heavy · +58
SYD
Sydney
smooth · +6
13,836 km · ~18h 14m est.
Runs reliable · 1 airline · 7x weekly · nonstop
100% on time
of the last 6 tracked IAH → SYD flights arrived within 15 minutes
Median arrival delay is −9 min. 0 of 7 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Median arrival−9 minacross the last 6 arrivals
Flight time~18h 14mestimated from route distance
Weekly departures7x1 direct airline on the leg
The week
scheduled departures · origin local time06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
United Airlines
Each mark is a scheduled departure at its origin-local time, observed operating in the last 7 days. Today is highlighted.
Who flies it
observed on the boards · 7 daysHistory
operated legs · board outcomesActual board outcomes rather than schedules, paired departure and arrival per flight and day.
Full board history, day by day →
Airports right now
live boardsWeather lens
Conditions are tightest at SYD: a 31% chance of a 15+ minute delay. In this weather, the more delayed of the two airports is typically about +5 min. Both figures come from the two airports' delay records in similar weather. See live delays → · Weather risk by airport →
next sweep in 120s
How the Houston to Sydney route actually runs
Pro Flight Search records official board updates for nonstop IAH to SYD flights through the day: schedules, estimates, gate pushes and actual departures. The verdict above comes from operated flights, so it reflects what this route does rather than what the timetable promises.
Planning around a delay? Live airport delays · Weather delay risk map · Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Cite this data
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Suggested citation
Pro Flight Search: Houston (IAH) to Sydney (SYD) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/IAH-SYD
IAH to SYD questions
Is IAH–SYD running on time right now?
Some delays possible. The departure side at IAH is the weaker end, route health score 56/100. The airports section above carries the live status and delay window at both ends.
How long is the flight from IAH to SYD?
Great-circle distance is 13,836 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 1007–1216 min gate-to-gate on this route.
How often does IAH–SYD fly?
United Airlines runs the route with about 7 flights a week (daily). Since one carrier owns the route, a single disruption tends to ripple through the day.
What does the route health score measure?
A blend of departure-side delay at IAH and arrival-side delay at SYD, computed from rolling delay windows (refreshed every 40 minutes) with a daily-rollup fallback. Current MVFR, IFR, or LIFR endpoint weather caps the score when flight rules can limit throughput. Higher is healthier: 100 means operations are clean at both ends.
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