UA4578 RochesterROC · 15:00 WashingtonIAD · 16:20
UA4578 by United Airlines flies from Rochester (ROC) to Washington (IAD).
scheduled from ROC
⚖ UA4578 typically leaves +13 and lands −22. The air wins minutes back.Where the minutes go
last 7 operations · gate push → arrivalThe bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.
The last 30 days
arrival outcome per operationmedian arrival −22 min · 0 cancelled · 10 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at ROC and IAD are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. For this route and airline, 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 →
When it flies
scheduled departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
Other Rochester to Washington flights today
same route · United AirlinesIf UA4578 is cancelled, these are the other United Airlines nonstop flights from Rochester to Washington on the same day, with scheduled departure times in ROC local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How UA4578 actually runs
Pro Flight Search has tracked every published board update for UA4578 across the ROC and IAD boards: schedule changes, gate pushes and actual clocks. Usually lands ~20 min early. Based on 9 confirmed landings · 7/9 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 UA4578 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: N523GJ, N554GJ, N563GJ, N546GJ.
Board clocks recorded as ROC and IAD published them.
Planning around UA4578? 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 — UA4578 Rochester to Washington on-time performance, measured from the ROC and IAD airport boards.
https://proflightsearch.com/flight/UA4578
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