UA4877 WashingtonIAD · 08:26 RochesterROC · 09:53
UA4877 by United Airlines flies from Washington (IAD) to Rochester (ROC) for the Mon, Nov 9 departure.
en route from IAD to ROC
board checked 14m ago · checking again in 45s
Board estimate · gate and arrival times. Off blocks 11:28 · typical taxi-out at IAD ≈ 7.5 min.
Where the minutes go
last 4 operations · gate push → arrivalThe bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at IAD and ROC are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. These figures come from both airports' records under conditions like today's, over the last 90 days.
Pro Flight Search tracking, 90 days · the weather × delay correlation study → · live weather risk by airport →
Tomorrow at Washington
ForecastTue 10 Nov, local date
Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.
Tomorrow at Rochester
ForecastTue 10 Nov, local date
Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.
When it flies
scheduled departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
Other Washington to Rochester flights today
same route · United AirlinesIf UA4877 is cancelled, these are the other United Airlines nonstop flights from Washington to Rochester on the same day, with scheduled departure times in IAD local time. Most flights that show a delay still operate. Rebooking usually helps only when that delay is very large. Every airline on this route →
How UA4877 actually runs
Pro Flight Search has tracked every published board update for UA4877 across the IAD and ROC boards: schedule changes, gate pushes and actual clocks. Usually lands on time. Based on 4 confirmed landings · 3/4 within 15 min of schedule. Pushes back late but makes up time in the air.
The verdict above is that record speaking, so it reflects how UA4877 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationAircraft
Recent tails: N14188, N16147.
Board clocks recorded as IAD and ROC published them.
Planning around UA4877? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Pro Flight Search: UA4877 Washington to Rochester on-time performance, measured from the IAD and ROC airport boards.
https://proflightsearch.com/flight/UA4877
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