Flight profile · United Airlines
UA591
Newark (EWR) to San Antonio (SAT) · scheduled 7:45 AM – 11:16 AM
How UA591 performs
441 operations, 2024-03-07 to 2026-06-30.
Source: US DOT Bureau of Transportation Statistics · 441 operations between 2024-03-07 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA591 | 84.7% | 0.68% | -15 min | 4.8% | 441 |
| United Airlines on EWR → SAT | 85.0% | 0.56% | -12 min | 5.0% | 1,783 |
| All EWR → SAT flights | 84.9% | 0.80% | -12 min | 5.1% | 2,003 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-03-07 to 2026-06-30
Other routes UA591 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 |
|---|---|---|---|
| EGE→ORD Eagle to Chicago | 2026-06-27 – 2026-06-28 | 2 | — |
| EGE→IAH Eagle to Houston | 2026-06-06 – 2026-06-21 | 6 | — |
| RNO→SFO Reno to San Francisco | 2026-05-31 – 2026-05-31 | 1 | — |
| MTJ→DEN Montrose to Denver | 2026-03-29 – 2026-04-05 | 8 | — |
| ECP→DEN Panama City Beach to Denver | 2026-03-07 – 2026-03-28 | 4 | — |
| ATL→IAH Atlanta to Houston | 2026-02-14 – 2026-02-28 | 3 | — |
| EWR→PBI Newark to West Palm Beach | 2026-01-08 – 2026-02-09 | 25 | — |
| HDN→EWR Hayden to Newark | 2026-01-08 – 2026-02-09 | 25 | — |
| IAD→AUS Washington to Austin | 2025-12-20 – 2026-01-03 | 3 | — |
| RIC→ORD Richmond to Chicago | 2025-12-06 – 2025-12-13 | 2 | — |
| EWR→ORD Newark to Chicago | 2025-10-05 – 2025-10-19 | 3 | — |
| EWR→CLE Newark to Cleveland | 2025-08-19 – 2025-09-24 | 37 | — |
| LAS→EWR Las Vegas to Newark | 2025-08-19 – 2025-09-01 | 14 | — |
| PNS→IAH Pensacola to Houston | 2025-08-01 – 2025-08-18 | 18 | — |
| EWR→ATL Newark to Atlanta | 2025-07-01 – 2025-07-31 | 31 | — |
| IAD→EWR Washington to Newark | 2025-05-22 – 2025-06-25 | 25 | — |
| EWR→MCI Newark to Kansas City | 2025-06-25 – 2025-06-25 | 1 | — |
| EWR→STL Newark to St. Louis | 2025-06-01 – 2025-06-24 | 24 | — |
| CVG→ORD Cincinnati / Covington to Chicago | 2025-03-30 – 2025-05-21 | 46 | — |
| EWR→CVG Newark to Cincinnati / Covington | 2023-07-01 – 2025-05-17 | 190 | 70.3% |
| IAH→LAS Houston to Las Vegas | 2025-04-05 – 2025-04-26 | 4 | — |
| IAD→BZN Washington to Bozeman | 2025-03-08 – 2025-03-29 | 4 | — |
| RSW→CLE Fort Myers to Cleveland | 2025-02-15 – 2025-03-01 | 3 | — |
| SAT→DEN San Antonio to Denver | 2024-10-27 – 2024-12-02 | 36 | — |
| SBN→LGA South Bend to New York | 2024-10-13 – 2024-10-13 | 1 | — |
| BTV→EWR Burlington to Newark | 2024-05-23 – 2024-09-25 | 126 | 94.9% |
| EWR→MYR Newark to Myrtle Beach | 2024-06-27 – 2024-08-18 | 45 | — |
| RDU→EWR Raleigh–Durham to Newark | 2024-02-15 – 2024-05-22 | 93 | 100.0% |
| ORD→IAD Chicago to Washington | 2024-04-14 – 2024-04-14 | 1 | — |
| ORD→MSP Chicago to Minneapolis | 2024-03-31 – 2024-03-31 | 1 | — |
| TPA→SFO Tampa to San Francisco | 2024-01-13 – 2024-02-10 | 5 | — |
| EWR→SAV Newark to Savannah | 2023-11-28 – 2023-11-28 | 1 | — |
| SFO→PDX San Francisco to Portland | 2023-11-23 – 2023-11-23 | 1 | — |
| SEA→EWR Seattle to Newark | 2023-07-01 – 2023-09-28 | 90 | 62.4% |
| ORD→SEA Chicago to Seattle | 2023-09-05 – 2023-09-28 | 24 | — |
| DEN→SEA Denver to Seattle | 2023-07-01 – 2023-09-02 | 47 | — |
Because the same number has served different journeys, the statistics above describe only the route UA591 currently operates. Blending them would produce an average of two different flights.
Why UA591 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
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for UA591 on EWR → SAT. 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 441 records of UA591 operating EWR → 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.