Flight profile · United Airlines
UA320
Denver (DEN) to Houston (IAH) · scheduled 5:00 AM – 8:31 AM
How UA320 performs
574 operations, 2024-12-03 to 2026-06-30.
UA320 arrived on time 94.4% of the time, against 76.9% for all DEN → IAH flights — this specific departure is 17.5 percentage points better than the route as a whole. Against United Airlines’s own flights on this route it is 17.1 points better.
Source: US DOT Bureau of Transportation Statistics · 574 operations between 2024-12-03 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA320 | 94.4% | 0.52% | -14 min | 1.4% | 574 |
| United Airlines on DEN → IAH | 77.3% | 0.78% | -4 min | 8.1% | 11,445 |
| All DEN → IAH flights | 76.9% | 0.83% | -5 min | 8.2% | 14,528 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-12-03 to 2026-06-30
Other routes UA320 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| IAH→SMF Houston to Sacramento | 2026-02-12 – 2026-03-04 | 18 | — |
| IAH→DFW Houston to Dallas–Fort Worth | 2024-02-15 – 2026-02-11 | 144 | 76.9% |
| DEN→SLC Denver to Salt Lake City | 2026-02-04 – 2026-02-04 | 1 | — |
| IAH→BWI Houston to Baltimore | 2025-12-18 – 2026-01-05 | 19 | — |
| ORD→DEN Chicago to Denver | 2025-11-30 – 2025-12-01 | 2 | — |
| IAH→LGA Houston to New York | 2025-08-19 – 2025-09-01 | 14 | — |
| IAH→IAD Houston to Washington | 2025-08-01 – 2025-08-18 | 18 | — |
| IAH→CMH Houston to Columbus | 2025-06-01 – 2025-07-31 | 53 | — |
| IAH→RSW Houston to Fort Myers | 2025-02-13 – 2025-03-05 | 18 | — |
| MSY→IAH New Orleans to Houston | 2024-05-02 – 2024-12-02 | 181 | 83.5% |
| DEN→PHL Denver to Philadelphia | 2024-08-20 – 2024-09-24 | 11 | — |
| BZN→DEN Bozeman to Denver | 2024-09-01 – 2024-09-01 | 1 | — |
| MIA→ORD Miami to Chicago | 2024-08-03 – 2024-08-17 | 3 | — |
| CLE→IAD Cleveland to Washington | 2024-05-25 – 2024-06-22 | 5 | — |
| SEA→IAH Seattle to Houston | 2024-02-15 – 2024-05-01 | 77 | — |
| EWR→ORD Newark to Chicago | 2024-01-09 – 2024-02-14 | 37 | — |
| ORD→LAS Chicago to Las Vegas | 2024-01-09 – 2024-01-31 | 23 | — |
| IAH→EYW Houston to Key West | 2023-12-21 – 2024-01-08 | 19 | — |
| ATL→IAD Atlanta to Washington | 2023-07-01 – 2023-12-20 | 173 | 82.8% |
Because the same number has served different journeys, the statistics above describe only the route UA320 currently operates. Blending them would produce an average of two different flights.
Why UA320 runs late
Where US DOT attributed the delay minutes on this flight.
airspace and airport capacity, including weather-driven flow control
crew, maintenance, boarding, fuelling — within the carrier’s control
the inbound aircraft was late, so this flight started late
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for UA320 on DEN → IAH. A single late flight can carry more than one cause, and only delays of fifteen minutes or more are attributed at all.
Other departures on DEN → IAH
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| UA1720 | United Airlines | 89.3% | 10 min early | 711 |
| UA1829 | United Airlines | 72.2% | 0 min early | 620 |
| UA475 | United Airlines | 72.2% | 4 min early | 909 |
| UA489 | United Airlines | 71.3% | 1 min late | 934 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 574 records of UA320 operating DEN → IAH, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.