Flight profile · United Airlines
UA1573
Los Angeles (LAX) to Washington (IAD) · scheduled 4:55 PM – 12:45 AM
How UA1573 performs
433 operations, 2024-08-19 to 2026-06-30.
UA1573 arrived on time 89.8% of the time, against 85.5% for all LAX → IAD flights — this specific departure is 4.2 percentage points better than the route as a whole. Against United Airlines’s own flights on this route it is 3.4 points better.
Source: US DOT Bureau of Transportation Statistics · 433 operations between 2024-08-19 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA1573 | 89.8% | 0.23% | -15 min | 4.9% | 433 |
| United Airlines on LAX → IAD | 86.3% | 0.82% | -10 min | 3.9% | 6,598 |
| All LAX → IAD flights | 85.5% | 0.74% | -9 min | 4.1% | 7,578 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-08-19 to 2026-06-30
Other routes UA1573 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 |
|---|---|---|---|
| ANC→ORD Anchorage to Chicago | 2026-03-05 – 2026-03-28 | 24 | — |
| EWR→FLL Newark to Fort Lauderdale | 2026-02-12 – 2026-03-04 | 21 | — |
| ORD→DTW Chicago to Detroit | 2026-01-06 – 2026-02-11 | 36 | — |
| DCA→ORD Washington to Chicago | 2026-01-08 – 2026-02-11 | 10 | — |
| FLL→IAH Fort Lauderdale to Houston | 2025-12-02 – 2025-12-17 | 16 | — |
| EWR→CHS Newark to Charleston | 2025-09-24 – 2025-09-24 | 1 | — |
| RDU→ORD Raleigh–Durham to Chicago | 2025-06-28 – 2025-07-26 | 5 | — |
| SFO→LAX San Francisco to Los Angeles | 2025-05-22 – 2025-06-25 | 30 | — |
| PHL→SFO Philadelphia to San Francisco | 2025-06-07 – 2025-06-21 | 3 | — |
| LAX→AUS Los Angeles to Austin | 2025-03-06 – 2025-03-07 | 2 | — |
| IAH→RSW Houston to Fort Myers | 2025-01-07 – 2025-02-12 | 37 | — |
| LAX→IAH Los Angeles to Houston | 2024-12-03 – 2024-12-18 | 16 | — |
| IAH→SFO Houston to San Francisco | 2024-11-30 – 2024-11-30 | 1 | — |
| IAH→CHS Houston to Charleston | 2023-11-28 – 2024-08-18 | 215 | 73.4% |
| EWR→RDU Newark to Raleigh–Durham | 2024-07-06 – 2024-08-17 | 7 | — |
| LAS→IAD Las Vegas to Washington | 2024-06-27 – 2024-06-30 | 4 | — |
| ORF→ORD Norfolk to Chicago | 2024-05-25 – 2024-05-25 | 1 | — |
| IAH→SDF Houston to Louisville | 2024-05-02 – 2024-05-05 | 2 | — |
| EWR→IAH Newark to Houston | 2023-11-28 – 2023-12-13 | 16 | — |
| IAH→LAS Houston to Las Vegas | 2023-07-01 – 2023-11-27 | 150 | 88.7% |
Because the same number has served different journeys, the statistics above describe only the route UA1573 currently operates. Blending them would produce an average of two different flights.
Why UA1573 runs late
Where US DOT attributed the delay minutes on this flight.
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding, fuelling — within the carrier’s control
airspace and airport capacity, including weather-driven flow control
Share of the delay minutes US DOT attributed to each cause for UA1573 on LAX → IAD. 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 LAX → IAD
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| UA2667 | United Airlines | 89.5% | 12 min early | 715 |
| UA1635 | United Airlines | 86.1% | 9 min early | 1,028 |
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 433 records of UA1573 operating LAX → IAD, 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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