Flight profile · United Airlines
UA1587
Washington (IAD) to Denver (DEN) · scheduled 12:40 PM – 2:42 PM
How UA1587 performs
384 operations, 2025-03-30 to 2026-06-30.
UA1587 arrived on time 90.8% of the time, against 81.5% for all IAD → DEN flights — this specific departure is 9.3 percentage points better than the route as a whole. Against United Airlines’s own flights on this route it is 8.7 points better.
Source: US DOT Bureau of Transportation Statistics · 384 operations between 2025-03-30 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA1587 | 90.8% | 0.26% | -11 min | 3.1% | 384 |
| United Airlines on IAD → DEN | 82.1% | 0.96% | -8 min | 6.7% | 7,586 |
| All IAD → DEN flights | 81.5% | 0.87% | -7 min | 6.5% | 9,994 |
Source: FlyerIntel analysis of US DOT BTS data · 2025-03-30 to 2026-06-30
Other routes UA1587 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 |
|---|---|---|---|
| DEN→IAH Denver to Houston | 2026-01-06 – 2026-05-31 | 125 | 81.6% |
| DEN→BOS Denver to Boston | 2025-10-26 – 2025-12-17 | 52 | — |
| DEN→RSW Denver to Fort Myers | 2025-09-25 – 2025-10-24 | 22 | — |
| DEN→OMA Denver to Omaha | 2025-09-02 – 2025-09-24 | 23 | — |
| ORF→IAD Norfolk to Washington | 2025-09-02 – 2025-09-24 | 23 | — |
| RDU→EWR Raleigh–Durham to Newark | 2024-05-23 – 2025-03-29 | 242 | 59.7% |
| FLL→EWR Fort Lauderdale to Newark | 2025-01-07 – 2025-02-12 | 37 | — |
| SFO→RDU San Francisco to Raleigh–Durham | 2024-12-19 – 2025-01-06 | 19 | — |
| RNO→SFO Reno to San Francisco | 2024-12-19 – 2024-12-19 | 1 | — |
| ATL→IAH Atlanta to Houston | 2024-12-07 – 2024-12-15 | 4 | — |
| IAD→LAX Washington to Los Angeles | 2024-05-02 – 2024-05-22 | 21 | — |
| ICT→DEN Wichita to Denver | 2024-03-31 – 2024-05-01 | 32 | — |
| PBI→IAH West Palm Beach to Houston | 2024-02-15 – 2024-03-30 | 45 | — |
| JAX→EWR Jacksonville to Newark | 2024-01-09 – 2024-02-14 | 31 | — |
| IAD→IAH Washington to Houston | 2024-02-11 – 2024-02-11 | 1 | — |
| MCI→LAS Kansas City to Las Vegas | 2024-02-08 – 2024-02-08 | 1 | — |
| ORD→SAV Chicago to Savannah | 2024-01-14 – 2024-01-14 | 1 | — |
| RDU→IAH Raleigh–Durham to Houston | 2023-12-21 – 2024-01-08 | 19 | — |
| PBI→EWR West Palm Beach to Newark | 2023-11-28 – 2023-12-20 | 23 | — |
| SFO→CLE San Francisco to Cleveland | 2023-10-29 – 2023-11-27 | 30 | — |
| EWR→DEN Newark to Denver | 2023-09-29 – 2023-10-28 | 30 | — |
| ORD→DCA Chicago to Washington | 2023-09-05 – 2023-09-28 | 21 | — |
| ORD→LAX Chicago to Los Angeles | 2023-07-01 – 2023-09-04 | 66 | — |
| MCI→ORD Kansas City to Chicago | 2023-08-01 – 2023-09-01 | 32 | — |
Because the same number has served different journeys, the statistics above describe only the route UA1587 currently operates. Blending them would produce an average of two different flights.
Why UA1587 runs late
Where US DOT attributed the delay minutes on this flight.
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
crew, maintenance, boarding, fuelling — within the carrier’s control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for UA1587 on IAD → DEN. A single late flight can carry more than one cause, and only delays of fifteen minutes or more are attributed at all.
Data and methodology
Calculated by FlyerIntel from 384 records of UA1587 operating IAD → DEN, 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.
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