Flight number record
UA 1859
United Airlines · Houston to Austin
- Route
- IAH → AUS
- Departs
- 12:05
- Flights
- 327
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1859, check with United Airlines.
UA 1859 lands a B, 5 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by roughly 45 minutes on average. That rests on 327 flights, with a median arrival 5 minutes early.
Set against the rest of the country, UA 1859's record is 5 points better than the US average of 77.3%. That gap is worth roughly 54 fewer late arrivals for every thousand flights.
Key figures
On time
82.7%
Arrivals under 15 minutes late, of 323 completed flights
Avg delay
47 min
Across delayed arrivals only, not all flights
Cancelled
1.22%
National rate is 1.89%
1 hour+ late
4.3%
National rate is 8.3%
These figures cover 327 flights between September 2025 and August 2026. The median arrival is 5 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When UA 1859 flies
UA 1859 flies IAH to AUS without a single fixed slot. Its most common scheduled departure was 12:05, used on 75 of 327 flights, with 12:10 (67 flights) and 11:55 (50 flights) next.
- Departs 12:0575 flights22.9%
- Departs 12:1067 flights20.5%
- Departs 11:5550 flights15.3%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 12:05 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and UA 1859 runs 4 points better at 82.7%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
UA 1859 next to IAH to AUS
Every carrier on IAH to AUS combined arrived on time 80.2% of the time across 2,671 flights, so UA 1859 is 3 points ahead of it. United flew 2,645 flights on the same city pair under all its flight numbers, including this one, and those ran 80.1% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1859thin sample | 327 | 82.7% | 47 min | 1.22% | B |
| All United Airlines on IAH–AUS | 2,645 | 80.1% | 62 min | 0.72% | B+ |
| All carriers on IAH–AUS | 2,671 | 80.2% | 62 min | 0.71% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1859 quarter by quarter
UA 1859 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Oct–Dec 2025 at 76.0%, a swing of 21 points on roughly 65 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights96.7%
- Oct–Dec 202577 flights76.0%
- Jan–Mar 202681 flights82.3%
- Apr–Jun 202687 flights83.9%
- Jul–Sep 202652 flights82.7%
Scale runs 70% to 100%.
By weekday, UA 1859 did best on Tuesday at 91.5% on time and worst on Sunday at 72.7%. Each day rests on about 47 flights, so a gap of 19 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1859 runs when it is late
The 56 late arrivals split 23 under half an hour, 19 between 30 and 60 minutes, and 14 an hour or more.
- 15+ min early51 flights15.8%
- Within 15 min216 flights66.9%
- 15–29 min late23 flights7.1%
- 30–59 min late19 flights5.9%
- 1–2 hours late12 flights3.7%
- 2+ hours late2 flights0.6%
Scale runs 0% to 100%.
Share of 323 completed flights by arrival against schedule.
10 of 43 late departures made up the time and arrived on time, 23% of them. In the other direction, 23 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at AUS.
The worst days
Worst days for UA 1859
The latest arrival of the period was on 30 November 2025, 2 hours 17 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. Three of the five worst days fell in November 2025.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 30 November 2025 | 2 hours 17 minutes | Late-arriving aircraft |
| 24 November 2025 | 2 hours 5 minutes | Extreme weather |
| 24 October 2025 | 1 hour 57 minutes | National Airspace System |
| 16 November 2025 | 1 hour 48 minutes | National Airspace System |
| 15 June 2026 | 1 hour 43 minutes | Extreme weather |
Delay causes
Why UA 1859 runs late
National Airspace System accounts for 43% of the 2,635 delay minutes carriers reported here, and the remaining four split what is left.
- 43%National Airspace System
- 28%Carrier
- 17%Late-arriving aircraft
- 12%Extreme weather
Extreme weather accounts for 12% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.0 times the usual weather exposure. The split is drawn from 2,635 delay minutes reported on UA 1859.
Cancellations sit at 1.22% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 4.3% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The same number turns up on six other city pairs in the data, including PIT to IAH (155), AUS to EWR (36) and PHL to IAH (21), but none flew often enough under UA 1859 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IAH to AUS only.
One caution: this is a thin sample. 327 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking UA 1859
For a booking, read UA 1859 as 82.7% on time with 1.22% cancelled over 327 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- IAH to AUS, every carrier and departure
- AUS to IAH, the return direction
- United Airlines 1711 on the same route68.5%
- United Airlines 2621 on the same route73.8%
- United Airlines 1179 on the same route80.5%
- George Bush Intercontinental (IAH) delay statistics
- Austin-Bergstrom International (AUS) delay statistics
- United Airlines on-time record
- Every United Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Worst months to fly in the US, ranked by the data
A flight number here means United Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.