UA3900 ChicagoORD HoustonIAH
UA3900 by United Airlines flies from Chicago (ORD) to Houston (IAH).
scheduled from ORD
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at ORD 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 Chicago to Houston flights today
same route · United AirlinesIf UA3900 is cancelled, these are the other United Airlines nonstop flights from Chicago to Houston on the same day, with scheduled departure times in ORD local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How UA3900 actually runs
Pro Flight Search has tracked every published board update for UA3900 across the ORD and IAH boards: schedule changes, gate pushes and actual clocks. Combined risk score: 1.6/100. Based on airport operations, weather, and cached board history at ORD and IAH.
The verdict above is that record speaking, so it reflects how UA3900 operates rather than what the timetable promises. Numbers refresh as new flights operate.
Planning around UA3900? 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 — UA3900 Chicago to Houston on-time performance, measured from the ORD and IAH airport boards.
https://proflightsearch.com/flight/UA3900
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