UA539 ChicagoORD · 07:05 HoustonIAH · 09:46
UA539 by United Airlines flies from Chicago (ORD) to Houston (IAH) for the Thu, Sep 10 departure.
Same number through ORD → DFW → IAH
en route from ORD to IAH
board checked 13m ago · checking again in 45s
Board estimate · gate and arrival times. Off blocks 06:59 · typical taxi-out at ORD ≈ 7.7 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 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 UA539 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 UA539 actually runs
Pro Flight Search has tracked every published board update for UA539 across the ORD and IAH boards: schedule changes, gate pushes and actual clocks. Usually lands ~12 min early. Based on 5 confirmed landings · 5/5 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 UA539 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: N37450, N17458, N57451, N61886.
Board clocks recorded as ORD and IAH published them.
Planning around UA539? 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 — UA539 Chicago to Houston on-time performance, measured from the ORD and IAH airport boards.
https://proflightsearch.com/flight/UA539
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