Flight number record

UA 456

United Airlines · Denver to Austin

Route: DEN → AUS
Departs: 08:05
Flights: 307
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 77.6%. When something does go wrong the average delay runs roughly 55 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 77.6%. That gap is worth roughly 158 fewer late arrivals for every thousand flights.

On time

93.4%

Arrivals under 15 minutes late, of 305 completed flights

Avg delay

53 min

Across delayed arrivals only, not all flights

Cancelled

0.33%

National rate is 1.81%

1 hour+ late

2.0%

National rate is 8.1%

These figures cover 307 flights between July 2025 and June 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.

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 08:15 (106 flights) and 08:00 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:05120 flights39.1%
Departs 08:15106 flights34.5%
Departs 08:0041 flights13.4%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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 84.1%, and UA 456 runs 9 points better at 93.4%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

UA 456 next to DEN to AUS

Every carrier on DEN to AUS combined arrived on time 76.1% of the time across 5,301 flights, so UA 456 is 17 points ahead of it. United flew 1,914 flights on the same city pair under all its flight numbers, including this one, and those ran 79.9% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 14 points.

UA 456 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 456thin sample	307	93.4%	53 min	0.33%	A+
All United Airlines on DEN–AUS	1,914	79.9%	64 min	0.63%	B+
All carriers on DEN–AUS	5,301	76.1%	61 min	0.60%	B+
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 456 quarter by quarter

Quarter by quarter UA 456 held fairly steady: 92.9% in Jul–Sep 2025, 87.7% in Oct–Dec 2025, 94.7% in Jan–Mar 2026 and 97.5% in Apr–Jun 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 202585 flights92.9%
Oct–Dec 202565 flights87.7%
Jan–Mar 202676 flights94.7%
Apr–Jun 202681 flights97.5%

Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, UA 456 ranged from 86.0% on Friday to 97.8% on Tuesday. With about 44 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why UA 456 runs late

One category carries most of the weight here. National Airspace System accounts for 68% of the 1,065 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

National Airspace System
68%
Late-arriving aircraft
20%
Carrier
11%

68% 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 725 minutes out of 1,065, against a national NAS share of 21%. The split is drawn from 1,065 delay minutes reported on UA 456.

Cancellations are rare at 0.33%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is 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 2.0% land an hour or more behind schedule, against 8.1% 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The same number turns up on eight other city pairs in the data, including AUS to ORD (113), ORD to CID (21) and ORD to DCA (17), 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: 93.4% on time and 0.33% cancelled. That is a base rate, not a promise about any single day.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures