Flight number record
UA 456
United Airlines · Denver to Austin
- Route
- DEN → AUS
- Departs
- 08:05
- Flights
- 307
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 456, check with United Airlines.
UA 456 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 16 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 50 minutes. That rests on 307 flights, with a median arrival 12 minutes early.
Set against the rest of the country, UA 456's record is 16 points better than the US average of 77.3%. That gap is worth roughly 158 fewer late arrivals for every thousand flights.
Key figures
On time
93.1%
Arrivals under 15 minutes late, of 306 completed flights
Avg delay
51 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
1.6%
National rate is 8.3%
These figures cover 307 flights between September 2025 and August 2026. The median arrival is 12 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 456 flies
UA 456 flies DEN to AUS without a single fixed slot. Its most common scheduled departure was 08:05, used on 120 of 307 flights, with 08:00 (100 flights) and 08:15 (47 flights) next.
- Departs 08:05120 flights39.1%
- Departs 08:00100 flights32.6%
- Departs 08:1547 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 08:05 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and UA 456 runs 9 points better at 93.1%. 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 456 next to DEN to AUS
Every carrier on DEN to AUS combined arrived on time 76.2% of the time across 5,486 flights, so UA 456 is 17 points ahead of it. United flew 1,883 flights on the same city pair under all its flight numbers, including this one, and those ran 79.6% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 456thin sample | 307 | 93.1% | 51 min | 0.00% | A+ |
| All United Airlines on DEN–AUS | 1,883 | 79.6% | 61 min | 0.32% | B+ |
| All carriers on DEN–AUS | 5,486 | 76.2% | 62 min | 0.55% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 456 quarter by quarter
Quarter by quarter UA 456 held fairly steady: 87.7% in Oct–Dec 2025, 94.7% in Jan–Mar 2026, 97.5% in Apr–Jun 2026 and 88.1% 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 202526 flights—
- Oct–Dec 202565 flights87.7%
- Jan–Mar 202676 flights94.7%
- Apr–Jun 202681 flights97.5%
- Jul–Sep 202659 flights88.1%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, UA 456 did best on Tuesday at 100.0% on time and worst on Friday at 84.0%. Each day rests on about 44 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 456 runs when it is late
UA 456 often beats the schedule: 112 of 306 completed flights, 37%, arrived 15 minutes or more early. The 21 late arrivals split 8 under half an hour, 8 between 30 and 60 minutes, and 5 an hour or more.
- 15+ min early112 flights36.6%
- Within 15 min173 flights56.5%
- 15–29 min late8 flights2.6%
- 30–59 min late8 flights2.6%
- 1–2 hours late4 flights1.3%
- 2+ hours late1 flights0.3%
Scale runs 0% to 100%.
Share of 306 completed flights by arrival against schedule.
Only 12 of 306 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 456
The latest arrival of the period was on 26 January 2026, 4 hours 5 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 26 January 2026 | 4 hours 5 minutes | National Airspace System |
| 7 November 2025 | 1 hour 33 minutes | National Airspace System |
| 21 August 2026 | 1 hour 21 minutes | Late-arriving aircraft |
| 31 October 2025 | 1 hour 5 minutes | National Airspace System |
| 11 February 2026 | 1 hour 2 minutes | Carrier |
Delay causes
Why UA 456 runs late
National Airspace System accounts for 60% of the 1,063 delay minutes carriers reported here, and the remaining four split what is left.
- 60%National Airspace System
- 26%Late-arriving aircraft
- 14%Carrier
60% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 635 minutes out of 1,063, against a national NAS share of 21%. The split is drawn from 1,063 delay minutes reported on UA 456.
Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 1.6% 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 775 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The same number turns up on seven other city pairs in the data, including AUS to ORD (175), ORD to DCA (56) and ORD to CID (21), but none flew often enough under UA 456 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to AUS only.
One caution: this is a thin sample. 307 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 456
For a booking, UA 456 has one of the better records a US domestic flight can show: 93.1% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- DEN to AUS, every carrier and departure
- AUS to DEN, the return direction
- United Airlines 1942 on the same route73.5%
- United Airlines 1026 on the same route82.4%
- Frontier Airlines 2890 on the same route63.6%
- United Airlines 2270 on the same route80.4%
- Denver International (DEN) delay statistics
- Austin-Bergstrom International (AUS) delay statistics
- United Airlines on-time record
- Every United Airlines flight number with a record
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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.