UA4587 WashingtonIAD · 08:20 St LouisSTL · 09:41
UA4587 by United Airlines flies from Washington (IAD) to St Louis (STL).
scheduled from IAD
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at IAD and STL 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 IAD
ForecastThu 5 Nov, local date
- 92% chance of rain
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 STL
ForecastThu 5 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 St Louis flights today
same route · United AirlinesIf UA4587 is cancelled, these are the other United Airlines nonstop flights from Washington to St Louis 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 UA4587 actually runs
Pro Flight Search has tracked every published board update for UA4587 across the IAD and STL boards: schedule changes, gate pushes and actual clocks. Early read: no clear pattern yet. Only 2 completed legs so far: left noticeably late (~27 min) but landed about 9 min early. Not enough to call it.
The verdict above is that record speaking, so it reflects how UA4587 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: N566GJ, N587GJ.
Board clocks recorded as IAD and STL published them.
Planning around UA4587? 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: UA4587 Washington to St Louis on-time performance, measured from the IAD and STL airport boards.
https://proflightsearch.com/flight/UA4587
.