Flight profile · United Airlines
UA637
Washington (IAD) to Austin (AUS) · scheduled 8:25 AM – 11:09 AM
How UA637 performs
347 operations, 2025-03-30 to 2026-06-30.
UA637 arrived on time 91.3% of the time, against 81.5% for all IAD → AUS flights — this specific departure is 9.8 percentage points better than the route as a whole. Against United Airlines’s own flights on this route it is 9.0 points better.
Source: US DOT Bureau of Transportation Statistics · 347 operations between 2025-03-30 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA637 | 91.3% | 0.58% | -14 min | 1.7% | 347 |
| United Airlines on IAD → AUS | 82.3% | 0.79% | -7 min | 6.4% | 2,895 |
| All IAD → AUS flights | 81.5% | 0.80% | -7 min | 6.5% | 3,235 |
Source: FlyerIntel analysis of US DOT BTS data · 2025-03-30 to 2026-06-30
Other routes UA637 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 |
|---|---|---|---|
| MYR→DEN Myrtle Beach to Denver | 2026-06-27 – 2026-06-27 | 1 | — |
| PWM→ORD Portland to Chicago | 2026-05-21 – 2026-06-24 | 35 | — |
| AUS→LAX Austin to Los Angeles | 2026-03-05 – 2026-05-20 | 77 | — |
| SYR→IAD Syracuse to Washington | 2026-05-01 – 2026-05-20 | 20 | — |
| LAX→PHX Los Angeles to Phoenix | 2026-04-03 – 2026-04-24 | 5 | — |
| IAD→HDN Washington to Hayden | 2025-12-20 – 2026-01-03 | 3 | — |
| BZN→IAD Bozeman to Washington | 2025-08-23 – 2025-08-31 | 4 | — |
| RSW→ORD Fort Myers to Chicago | 2025-05-24 – 2025-06-21 | 5 | — |
| DFW→EWR Dallas–Fort Worth to Newark | 2024-10-27 – 2025-03-28 | 148 | 87.7% |
| MSY→EWR New Orleans to Newark | 2025-02-10 – 2025-02-10 | 1 | — |
| MSY→DEN New Orleans to Denver | 2023-07-01 – 2024-10-26 | 352 | 82.3% |
| TYS→DEN Knoxville/Maryville to Denver | 2024-06-27 – 2024-08-18 | 53 | — |
| DEN→RNO Denver to Reno | 2024-06-27 – 2024-08-18 | 51 | — |
| AVL→DEN Asheville to Denver | 2024-05-23 – 2024-06-26 | 35 | — |
| SEA→LAX Seattle to Los Angeles | 2024-03-07 – 2024-03-30 | 24 | — |
| EWR→BZN Newark to Bozeman | 2023-12-21 – 2024-01-08 | 19 | — |
Because the same number has served different journeys, the statistics above describe only the route UA637 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 347 records of UA637 operating IAD → AUS, 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.