Flight profile · United Airlines
UA588
Denver (DEN) to Houston (IAH) · scheduled 4:34 PM – 8:12 PM
How UA588 performs
139 operations, 2026-02-12 to 2026-06-30.
UA588 arrived on time 78.4% of the time, against 76.9% for all DEN → IAH flights — this specific departure is 1.5 percentage points better than the route as a whole. Against United Airlines’s own flights on this route it is 1.1 points better.
Source: US DOT Bureau of Transportation Statistics · 139 operations between 2026-02-12 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA588 | 78.4% | 0.00% | -7 min | 8.6% | 139 |
| 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 · 2026-02-12 to 2026-06-30
Other routes UA588 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 |
|---|---|---|---|
| DRO→DEN Durango to Denver | 2024-01-09 – 2026-05-20 | 786 | 83.5% |
| DEN→JAC Denver to Jackson | 2025-06-26 – 2025-08-18 | 54 | — |
| FLL→DEN Fort Lauderdale to Denver | 2023-12-21 – 2024-01-08 | 19 | — |
| BWI→SFO Baltimore to San Francisco | 2023-10-29 – 2023-12-18 | 32 | — |
| MIA→ORD Miami to Chicago | 2023-10-01 – 2023-10-28 | 28 | — |
| EWR→MIA Newark to Miami | 2023-09-29 – 2023-09-29 | 1 | — |
| EWR→BNA Newark to Nashville | 2023-07-08 – 2023-09-28 | 28 | — |
| EWR→CLE Newark to Cleveland | 2023-08-01 – 2023-09-04 | 35 | — |
| EWR→PWM Newark to Portland | 2023-07-05 – 2023-07-28 | 18 | — |
Because the same number has served different journeys, the statistics above describe only the route UA588 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 139 records of UA588 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.