Flight profile · United Airlines
UA1535
Washington (IAD) to Houston (IAH) · scheduled 12:50 PM – 3:04 PM
How UA1535 performs
389 operations, 2025-03-06 to 2026-06-30.
UA1535 arrived on time 82.8% of the time, against 81.0% for all IAD → IAH flights — this specific departure is 1.8 percentage points better than the route as a whole. Against United Airlines’s own flights on this route it is 1.8 points better.
Source: US DOT Bureau of Transportation Statistics · 389 operations between 2025-03-06 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA1535 | 82.8% | 0.77% | -10 min | 6.0% | 389 |
| United Airlines on IAD → IAH | 81.0% | 0.84% | -7 min | 6.0% | 5,349 |
| All IAD → IAH flights | 81.0% | 0.84% | -7 min | 6.0% | 5,349 |
Source: FlyerIntel analysis of US DOT BTS data · 2025-03-06 to 2026-06-30
Other routes UA1535 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→DFW Houston to Dallas–Fort Worth | 2025-12-18 – 2026-06-30 | 157 | 72.1% |
| RDU→IAD Raleigh–Durham to Washington | 2026-03-05 – 2026-06-30 | 118 | 94.1% |
| IAH→SFO Houston to San Francisco | 2025-10-01 – 2025-10-31 | 31 | — |
| SFO→LAX San Francisco to Los Angeles | 2025-10-01 – 2025-10-25 | 25 | — |
| IAH→MSY Houston to New Orleans | 2025-08-19 – 2025-09-24 | 34 | — |
| CLE→IAD Cleveland to Washington | 2025-02-13 – 2025-03-05 | 21 | — |
| DFW→DEN Dallas–Fort Worth to Denver | 2025-01-07 – 2025-02-12 | 37 | — |
| LAX→SEA Los Angeles to Seattle | 2025-01-06 – 2025-01-06 | 1 | — |
| ORD→GRR Chicago to Grand Rapids | 2024-03-31 – 2025-01-05 | 225 | 69.4% |
| SNA→ORD Santa Ana to Chicago | 2024-09-26 – 2024-12-18 | 83 | — |
| FLL→ORD Fort Lauderdale to Chicago | 2023-12-21 – 2024-09-25 | 223 | 56.7% |
| PHL→ORD Philadelphia to Chicago | 2024-03-31 – 2024-03-31 | 1 | — |
| ORD→PDX Chicago to Portland | 2024-03-07 – 2024-03-30 | 24 | — |
| ORD→GEG Chicago to Spokane | 2023-12-21 – 2024-01-08 | 16 | — |
| LAX→BOS Los Angeles to Boston | 2023-11-28 – 2023-12-20 | 23 | — |
| ORD→SFO Chicago to San Francisco | 2023-10-29 – 2023-11-27 | 29 | — |
| ROC→ORD Rochester to Chicago | 2023-10-30 – 2023-11-27 | 24 | — |
| CMH→ORD Columbus to Chicago | 2023-07-02 – 2023-10-28 | 111 | 63.3% |
| ORD→RNO Chicago to Reno | 2023-09-08 – 2023-09-23 | 6 | — |
| PSP→SFO Palm Springs to San Francisco | 2023-09-05 – 2023-09-05 | 1 | — |
| ORD→SAN Chicago to San Diego | 2023-07-01 – 2023-09-04 | 66 | — |
Because the same number has served different journeys, the statistics above describe only the route UA1535 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 389 records of UA1535 operating IAD → 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.