Flight profile · United Airlines
UA1734
Boston (BOS) to Washington (IAD) · scheduled 5:30 AM – 7:04 AM
How UA1734 performs
592 operations, 2024-10-27 to 2026-06-30.
UA1734 arrived on time 96.1% of the time, against 83.6% for all BOS → IAD flights — this specific departure is 12.5 percentage points better than the route as a whole. Against United Airlines’s own flights on this route it is 12.5 points better.
Source: US DOT Bureau of Transportation Statistics · 592 operations between 2024-10-27 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA1734 | 96.1% | 1.52% | -12 min | 0.9% | 592 |
| United Airlines on BOS → IAD | 83.6% | 1.28% | -9 min | 6.1% | 4,464 |
| All BOS → IAD flights | 83.6% | 1.27% | -9 min | 6.1% | 4,476 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-10-27 to 2026-06-30
Other routes UA1734 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 |
|---|---|---|---|
| IAD→LAX Washington to Los Angeles | 2025-05-22 – 2026-06-29 | 181 | 84.8% |
| IAD→AUS Washington to Austin | 2026-05-24 – 2026-06-24 | 15 | — |
| IAD→PIT Washington to Pittsburgh | 2025-09-25 – 2025-12-01 | 52 | — |
| IAD→BZN Washington to Bozeman | 2025-09-06 – 2025-09-21 | 6 | — |
| IAD→SEA Washington to Seattle | 2025-06-26 – 2025-07-31 | 35 | — |
| IAD→ATL Washington to Atlanta | 2025-06-01 – 2025-06-25 | 25 | — |
| IAD→ORD Washington to Chicago | 2024-03-07 – 2025-03-29 | 48 | — |
| IAD→MSP Washington to Minneapolis | 2024-12-05 – 2024-12-12 | 2 | — |
| SAN→SFO San Diego to San Francisco | 2023-08-01 – 2024-10-26 | 277 | 64.6% |
| FAT→ORD Fresno to Chicago | 2024-06-27 – 2024-08-18 | 52 | — |
| IAH→IAD Houston to Washington | 2024-05-02 – 2024-05-22 | 21 | — |
| LAX→DEN Los Angeles to Denver | 2024-03-31 – 2024-05-01 | 32 | — |
| LGA→IAH New York to Houston | 2023-07-02 – 2024-03-06 | 52 | — |
| SFO→CLE San Francisco to Cleveland | 2023-11-28 – 2023-12-20 | 23 | — |
| AUS→IAH Austin to Houston | 2023-11-26 – 2023-11-26 | 1 | — |
| MIA→SFO Miami to San Francisco | 2023-09-30 – 2023-10-28 | 13 | — |
| LAX→LAS Los Angeles to Las Vegas | 2023-09-04 – 2023-09-04 | 1 | — |
Because the same number has served different journeys, the statistics above describe only the route UA1734 currently operates. Blending them would produce an average of two different flights.
Why UA1734 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
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for UA1734 on BOS → 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 BOS → IAD
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| UA2098 | United Airlines | 90.1% | 10 min early | 695 |
| UA721 | United Airlines | 74.1% | 0 min early | 641 |
| UA2136 | United Airlines | 71.9% | 4 min early | 1,059 |
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 592 records of UA1734 operating BOS → 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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