UA5559 HoustonIAH · 08:00 St LouisSTL · 10:10
UA5559 by United Airlines flies from Houston (IAH) to St Louis (STL) for the Wed, Aug 19 departure.
departs IAH · on schedule
board checked 59m ago · checking again in 45s
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at IAH and STL 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 Houston to St Louis flights today
same route · United AirlinesIf UA5559 is cancelled, these are the other United Airlines nonstop flights from Houston to St Louis on the same day, with scheduled departure times in IAH local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How UA5559 actually runs
Pro Flight Search has tracked every published board update for UA5559 across the IAH and STL boards: schedule changes, gate pushes and actual clocks. Early read — pattern not clear yet. Only 2 completed legs so far: left about 9 min early but landed about 19 min early. Not enough to call it.
The verdict above is that record speaking, so it reflects how UA5559 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: N134SY.
Board clocks recorded as IAH and STL published them.
Planning around UA5559? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — UA5559 Houston to St Louis on-time performance, measured from the IAH and STL airport boards.
https://proflightsearch.com/flight/UA5559
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