Flight profile · United Airlines
UA755
Washington (IAD) to Boston (BOS) · scheduled 10:18 PM – 11:59 PM
How UA755 performs
571 operations, 2024-10-27 to 2026-06-30.
UA755 arrived on time 80.0% of the time, against 77.6% for all IAD → BOS flights — this specific departure is 2.4 percentage points better than the route as a whole. Against United Airlines’s own flights on this route it is 2.4 points better.
Source: US DOT Bureau of Transportation Statistics · 571 operations between 2024-10-27 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA755 | 80.0% | 1.75% | -4 min | 6.6% | 571 |
| United Airlines on IAD → BOS | 77.6% | 1.48% | -5 min | 8.9% | 4,463 |
| All IAD → BOS flights | 77.6% | 1.47% | -5 min | 8.9% | 4,475 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-10-27 to 2026-06-30
Other routes UA755 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 |
|---|---|---|---|
| SEA→IAD Seattle to Washington | 2023-08-01 – 2026-05-20 | 56 | — |
| SFO→IAD San Francisco to Washington | 2025-03-06 – 2026-04-29 | 101 | 76.0% |
| RNO→SFO Reno to San Francisco | 2026-03-05 – 2026-04-29 | 53 | — |
| SAN→IAD San Diego to Washington | 2025-03-30 – 2025-12-17 | 260 | 84.9% |
| PHX→SFO Phoenix to San Francisco | 2025-03-06 – 2025-03-29 | 24 | — |
| PHX→IAD Phoenix to Washington | 2023-10-29 – 2025-03-05 | 207 | 86.0% |
| ORD→PHX Chicago to Phoenix | 2024-02-15 – 2024-12-02 | 292 | 83.7% |
| RDU→ORD Raleigh–Durham to Chicago | 2024-06-27 – 2024-08-18 | 53 | — |
| MIA→DEN Miami to Denver | 2024-01-09 – 2024-02-14 | 37 | — |
| IAH→RNO Houston to Reno | 2023-12-21 – 2024-01-08 | 19 | — |
| IAH→SFO Houston to San Francisco | 2023-12-20 – 2023-12-20 | 1 | — |
| IAD→CLE Washington to Cleveland | 2023-07-01 – 2023-10-28 | 119 | 78.8% |
| LAX→IAD Los Angeles to Washington | 2023-07-05 – 2023-07-31 | 24 | — |
Because the same number has served different journeys, the statistics above describe only the route UA755 currently operates. Blending them would produce an average of two different flights.
Why UA755 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding, fuelling — within the carrier’s control
the inbound aircraft was late, so this flight started late
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 UA755 on IAD → BOS. 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 → BOS
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| UA641 | United Airlines | 91.8% | 10 min early | 1,072 |
| UA688 | United Airlines | 61.5% | 4 min late | 1,005 |
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 571 records of UA755 operating IAD → BOS, 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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