Flight profile · United Airlines
UA1938
Washington (IAD) to Phoenix (PHX) · scheduled 5:50 PM – 7:15 PM
How UA1938 performs
952 operations, 2023-07-01 to 2026-06-30.
UA1938 arrived on time 77.5% of the time, against 81.6% for all IAD → PHX flights — this specific departure is 4.1 percentage points worse than the route as a whole. Against United Airlines’s own flights on this route it is 7.5 points worse.
Source: US DOT Bureau of Transportation Statistics · 952 operations between 2023-07-01 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA1938 | 77.5% | 1.79% | -6 min | 8.4% | 952 |
| United Airlines on IAD → PHX | 85.0% | 1.09% | -11 min | 5.3% | 2,303 |
| All IAD → PHX flights | 81.6% | 0.94% | -8 min | 5.8% | 3,070 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30
By day of week
Does UA1938 run worse on particular days?
Tuesday is historically the most reliable day and Saturday the least, a gap of 9.5 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30 · Days with fewer than 120 operations are not scored.
Other routes UA1938 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 |
|---|---|---|---|
| JAX→IAD Jacksonville to Washington | 2025-01-07 – 2026-05-20 | 375 | 88.7% |
| ORD→JAX Chicago to Jacksonville | 2026-02-12 – 2026-04-29 | 44 | — |
| PHX→ORD Phoenix to Chicago | 2025-11-29 – 2025-11-30 | 2 | — |
| EWR→JAX Newark to Jacksonville | 2025-06-16 – 2025-06-25 | 9 | — |
| IAD→LAS Washington to Las Vegas | 2025-01-06 – 2025-01-06 | 1 | — |
| MIA→IAD Miami to Washington | 2023-09-29 – 2024-08-18 | 172 | 81.7% |
Because the same number has served different journeys, the statistics above describe only the route UA1938 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 952 records of UA1938 operating IAD → PHX, 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.