UA4004 WashingtonDCA · 14:40 HoustonIAH · 17:17
UA4004 by United Airlines flies from Washington (DCA) to Houston (IAH) for the Mon, Oct 19 departure.
arrived at IAH · 37 min early
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at DCA and IAH 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 Washington to Houston flights today
same route · United AirlinesIf UA4004 is cancelled, these are the other United Airlines nonstop flights from Washington to Houston on the same day, with scheduled departure times in DCA local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How UA4004 actually runs
Pro Flight Search has tracked every published board update for UA4004 across the DCA and IAH boards: schedule changes, gate pushes and actual clocks. Early read — pattern not clear yet. Only 2 completed legs so far: landed -37 min. Not enough to call it.
The verdict above is that record speaking, so it reflects how UA4004 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationBoard clocks recorded as DCA and IAH published them.
Planning around UA4004? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — UA4004 Washington to Houston on-time performance, measured from the DCA and IAH airport boards.
https://proflightsearch.com/flight/UA4004
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