Carrier performance at one airport
UA→AUS
United Airlines at Austin-Bergstrom International
- Departures
- 10,877
- Period
- September 2025 to August 2026
- Routes
- 7
- Rank here
- #4 of 11
United Airlines at Austin lands a B, 3 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 10,877 flights, of which Alaska Airlines flew 1,886 at 84.3% on time.
Measured against the airport rather than the country, United Airlines runs 4 points ahead of the 76.5% weighted average across all carriers at AUS. That is the comparison worth making: every operator here works the same runways, the same airspace and the same weather.
Key figures
On time
80.1%
10,720 completed departures
Avg delay
75 min
Across delayed flights only
Cancelled
1.12%
At AUS, this carrier only
Rank here
#4
Of 11 carriers clearing the floor at AUS
These figures cover 11,000 flights between September 2025 and August 2026. The median arrival is 6 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.
Against the competition
Every carrier at AUS, ranked
The choice of carrier is not cosmetic here. Alaska Airlines arrives on time 84.3% of the time; Spirit Airlines manages 62.8%. Sample sizes sit next to every figure, because a two-point gap across 812 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Alaska Airlines | 1,886 | 84.3% | 50 min | 1.01% | B |
| Delta Air Lines | 13,200 | 82.6% | 79 min | 1.52% | B |
| SkyWest Airlines | 8,430 | 80.9% | 85 min | 0.87% | B+ |
| United Airlines (this page) | 10,877 | 80.1% | 75 min | 1.12% | B |
| Envoy Air | 792 | 79.1% | 94 min | 2.65% | B |
| American Airlines | 11,662 | 76.7% | 118 min | 2.28% | B |
| Frontier Airlines | 1,821 | 74.1% | 80 min | 1.48% | C |
| Southwest Airlines | 38,550 | 72.8% | 51 min | 0.61% | C+ |
| JetBlue Airways | 973 | 66.8% | 77 min | 2.26% | C |
| Allegiant Air | 605 | 65.6% | 83 min | 0.33% | C+ |
| Spirit Airlines | 812 | 62.8% | 84 min | 6.53% | D− |
Spirit Airlines cancels 6.5% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.
Route by route
Where United Airlines flies from AUS
United Airlines operates 7 routes out of AUS with enough volume to report. Route records inside one carrier at one airport still spread widely, because a short shuttle and a transcontinental have very different exposure to a late inbound.
| Route | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AUS to IAH · Houston | 2,643 | 77.0% | 58 min | 1.02% | B |
| AUS to DEN · Denver | 1,885 | 85.7% | 72 min | 0.69% | A+ |
| AUS to EWR · Newark | 1,734 | 80.4% | 95 min | 2.71% | B |
| AUS to SFO · San Francisco | 1,638 | 75.5% | 76 min | 0.37% | B+ |
| AUS to ORD · Chicago | 1,549 | 74.1% | 83 min | 1.29% | C |
| AUS to IAD · Washington | 988 | 90.1% | 91 min | 0.81% | A+ |
| AUS to LAX · Los Angeles | 440 | 89.0% | 68 min | 0.23% | A+ |
Flight by flight
United Airlines flight numbers from AUS
17 United Airlines flight numbers leaving AUS flew their main route often enough to have a record of their own. Grouped by destination.
- UA 595to DEN 09:0089.0%
- UA 779to DEN 11:2792.8%
- UA 2447to DEN 14:4582.2%
- UA 1449to EWR 07:0592.6%
- UA 1499to EWR 10:4084.5%
- UA 1760to EWR 06:0093.5%
- UA 376to IAD 17:0086.6%
- UA 525to IAD 07:1593.4%
- UA 2344to IAD 12:0088.7%
- UA 1326to IAH 17:5968.6%
- UA 1747to IAH 12:1571.7%
- UA 1966to IAH 05:3095.0%
- UA 2196to IAH 09:3576.7%
- UA 1878to ORD 07:0089.1%
- UA 1990to ORD 17:2057.2%
- UA 292to SFO 17:5861.0%
- UA 1668to SFO 08:4571.0%
Departure window
Best time of day for this operation
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 33 points, against 22 points between the best and worst carrier.
- 5am–8am2,602 flights89.3%
- 8am–11am1,901 flights83.5%
- 11am–2pm1,916 flights82.2%
- 2pm–5pm2,021 flights73.8%
- 5pm–8pm2,206 flights72.8%
- 8pm–5am231 flights56.5%
Scale runs 50% to 95%.
The 8pm–5am window is where this operation falls apart: 56.5% on time, against 89.3% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 5am–8am window is the busiest, with 2,602 flights scheduled in it.
Across the year
Seasonal pattern
Delays peak in November, when the on-time rate falls to 75.0%. February is the strongest month at 88.5%. Moving a flexible trip across that boundary buys 14 points. March was the busiest month here, with 999 flights.
Delay causes
What holds this operation up
- 46%National Airspace System
- 30%Late-arriving aircraft
- 22%Carrier
- 2%Extreme weather
46% 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 73,000 minutes out of 160,000, against a national NAS share of 21%. The split is drawn from 159,974 reported delay minutes.
Cancellations sit at 1.12% against a national 1.89%, which is ordinary. Diversions add another 0.32%.
7.3% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.
The sample behind these figures is 10,877 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Put together: the calendar is the biggest lever here, not the carrier or the hour. February runs 88.5% on time and November 75.0%, a swing of 14 points. If the dates move at all, move them out of November before you think about anything else. 10,720 completed flights over 12 months sit behind that.
Common questions
United Airlines at AUS
How often is United Airlines at AUS delayed?
About one flight in five arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 19.9% of the 10,877 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
Which airline is most reliable on United Airlines at AUS?
Alaska Airlines leads at 84.3% on time across 1,886 flights. Spirit Airlines is at the other end on 62.8%, a gap of 22 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on United Airlines at AUS?
The 5am–8am departure window is the strongest at 89.3% on time. The 8pm–5am window is the weakest at 56.5%, 33 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are November delays on United Airlines at AUS?
November is the weakest month at 75.0% on time, compared with 88.5% in February. Across the year that is 14 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
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.