Flight number record
UA 1966
United Airlines · Austin to Houston
- Route
- AUS → IAH
- Departs
- 05:30
- Flights
- 327
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1966, check with United Airlines.
UA 1966 earns an A. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 18 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 327 flights, with a median arrival 14 minutes early.
Set against the rest of the country, UA 1966's record is 18 points better than the US average of 77.3%. That gap is worth roughly 177 fewer late arrivals for every thousand flights.
Key figures
On time
95.0%
Arrivals under 15 minutes late, of 321 completed flights
Avg delay
99 min
Across delayed arrivals only, not all flights
Cancelled
1.83%
National rate is 1.89%
1 hour+ late
2.2%
National rate is 8.3%
These figures cover 327 flights between September 2025 and August 2026. The median arrival is 14 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 1966 flies
UA 1966 is scheduled to leave Austin (AUS) at 05:30 local time and reach Houston (IAH) at 06:33. That slot held for 283 of the 327 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.
- Departs 05:30283 flights86.5%
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 05:30 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and UA 1966 runs 6 points better at 95.0%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
UA 1966 next to AUS to IAH
Every carrier on AUS to IAH combined arrived on time 77.2% of the time across 2,670 flights, so UA 1966 is 18 points ahead of it. United flew 2,643 flights on the same city pair under all its flight numbers, including this one, and those ran 77.0% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 16 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1966thin sample | 327 | 95.0% | 99 min | 1.83% | A |
| All United Airlines on AUS–IAH | 2,643 | 77.0% | 58 min | 1.02% | B |
| All carriers on AUS–IAH | 2,670 | 77.2% | 58 min | 1.01% | B |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1966 quarter by quarter
Quarter by quarter UA 1966 held fairly steady: 95.6% in Oct–Dec 2025, 97.7% in Jan–Mar 2026, 90.1% in Apr–Jun 2026 and 100.0% in Jul–Sep 2026. A spread of 10 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 20256 flights—
- Oct–Dec 202591 flights95.6%
- Jan–Mar 202689 flights97.7%
- Apr–Jun 202684 flights90.1%
- Jul–Sep 202657 flights100.0%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1966 did best on Friday at 100.0% on time and worst on Sunday at 87.8%. Each day rests on about 47 flights, so a gap of 12 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1966 runs when it is late
UA 1966 often beats the schedule: 151 of 321 completed flights, 47%, arrived 15 minutes or more early. The 16 late arrivals split 4 under half an hour, 5 between 30 and 60 minutes, and 7 an hour or more.
- 15+ min early151 flights47.0%
- Within 15 min154 flights48.0%
- 15–29 min late4 flights1.2%
- 30–59 min late5 flights1.6%
- 1–2 hours late3 flights0.9%
- 2+ hours late4 flights1.2%
Scale runs 0% to 100%.
Share of 321 completed flights by arrival against schedule.
Only 15 of 321 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for UA 1966
The latest arrival of the period was on 29 September 2025, 9 hours 13 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 29 September 2025 | 9 hours 13 minutes | Carrier |
| 19 April 2026 | 3 hours 40 minutes | Carrier |
| 25 September 2025 | 2 hours 43 minutes | Carrier |
| 16 December 2025 | 2 hours 28 minutes | Carrier |
| 15 June 2026 | 1 hour 31 minutes | Extreme weather |
Delay causes
Why UA 1966 runs late
Carrier accounts for 82% of the 1,588 delay minutes carriers reported here, and the remaining four split what is left.
- 82%Carrier
- 12%National Airspace System
- 5%Extreme weather
The largest share of delay minutes, 82%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,309 of the 1,588 delay minutes reported here. The split is drawn from 1,588 delay minutes reported on UA 1966.
Cancellations sit at 1.83% 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 2.2% 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 four other city pairs in the data, including IAH to MIA (163), IAH to LGA (123) and IAH to DEN (19), but none flew often enough under UA 1966 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to AUS to IAH 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 1966
For a booking, read UA 1966 as 95.0% on time with 1.83% cancelled over 327 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- AUS to IAH, every carrier and departure
- IAH to AUS, the return direction
- United Airlines 1326 on the same route68.6%
- United Airlines 2196 on the same route76.7%
- United Airlines 1747 on the same route71.7%
- Austin-Bergstrom International (AUS) delay statistics
- George Bush Intercontinental (IAH) 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.