Flight profile · United Airlines
UA1789
Washington (IAD) to San Antonio (SAT) · scheduled 8:15 AM – 11:03 AM
How UA1789 performs
416 operations, 2025-01-07 to 2026-06-30.
UA1789 arrived on time 93.2% of the time, against 83.2% for all IAD → SAT flights — this specific departure is 10.0 percentage points better than the route as a whole. Against United Airlines’s own flights on this route it is 10.0 points better.
Source: US DOT Bureau of Transportation Statistics · 416 operations between 2025-01-07 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA1789 | 93.2% | 0.48% | -15 min | 1.9% | 416 |
| United Airlines on IAD → SAT | 83.2% | 1.07% | -8 min | 6.9% | 1,966 |
| All IAD → SAT flights | 83.2% | 1.07% | -8 min | 6.9% | 1,966 |
Source: FlyerIntel analysis of US DOT BTS data · 2025-01-07 to 2026-06-30
Other routes UA1789 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 |
|---|---|---|---|
| RDU→IAD Raleigh–Durham to Washington | 2026-02-12 – 2026-06-30 | 138 | 96.3% |
| SAT→DEN San Antonio to Denver | 2025-12-18 – 2026-05-18 | 111 | 85.6% |
| ORD→BUF Chicago to Buffalo | 2025-07-05 – 2025-07-26 | 4 | — |
| MSY→IAD New Orleans to Washington | 2025-03-30 – 2025-03-30 | 1 | — |
| ORD→DCA Chicago to Washington | 2024-01-09 – 2025-01-06 | 41 | — |
| RSW→SFO Fort Myers to San Francisco | 2024-12-24 – 2025-01-03 | 11 | — |
| EWR→ORD Newark to Chicago | 2024-12-23 – 2024-12-23 | 1 | — |
| MCO→DEN Orlando to Denver | 2024-12-03 – 2024-12-18 | 16 | — |
| DEN→ELP Denver to El Paso | 2024-10-27 – 2024-12-02 | 37 | — |
| SJC→IAH San Jose to Houston | 2024-08-19 – 2024-10-26 | 45 | — |
| ABQ→SFO Albuquerque to San Francisco | 2024-09-03 – 2024-09-25 | 20 | — |
| EWR→IAD Newark to Washington | 2024-09-02 – 2024-09-02 | 1 | — |
| IAH→MIA Houston to Miami | 2024-07-03 – 2024-08-18 | 30 | — |
| LAX→CLE Los Angeles to Cleveland | 2024-06-27 – 2024-06-30 | 3 | — |
| IAD→LAX Washington to Los Angeles | 2024-05-23 – 2024-06-26 | 35 | — |
| MSN→EWR Madison to Newark | 2024-05-02 – 2024-05-22 | 21 | — |
| IAH→ORD Houston to Chicago | 2024-03-31 – 2024-05-01 | 32 | — |
| FLL→IAH Fort Lauderdale to Houston | 2024-03-07 – 2024-03-30 | 24 | — |
| SDF→ORD Louisville to Chicago | 2024-02-15 – 2024-03-06 | 15 | — |
| EWR→MCO Newark to Orlando | 2023-10-29 – 2024-01-08 | 72 | — |
| LAS→IAH Las Vegas to Houston | 2023-07-01 – 2023-10-28 | 114 | 85.7% |
| IND→EWR Indianapolis to Newark | 2023-09-29 – 2023-09-30 | 2 | — |
Because the same number has served different journeys, the statistics above describe only the route UA1789 currently operates. Blending them would produce an average of two different flights.
Why UA1789 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding, fuelling — within the carrier’s control
airspace and airport capacity, including weather-driven flow control
the inbound aircraft was late, so this flight started late
Share of the delay minutes US DOT attributed to each cause for UA1789 on IAD → SAT. 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 IAD → SAT
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| UA1869 | United Airlines | 76.4% | 5 min early | 1,051 |
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 416 records of UA1789 operating IAD → SAT, 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.