AA4251 ChicagoORD · 22:48 Sioux FallsFSD · 00:41
AA4251 by American Airlines flies from Chicago (ORD) to Sioux Falls (FSD) for the Sat, Oct 17 departure.
departs ORD · on schedule
board checked 17m ago · checking again in 45s
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at ORD and FSD 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 Sioux Falls flights today
same route · American AirlinesIf AA4251 is cancelled, these are the other American Airlines nonstop flights from Chicago to Sioux Falls 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 AA4251 actually runs
Pro Flight Search has tracked every published board update for AA4251 across the ORD and FSD boards: schedule changes, gate pushes and actual clocks. Early read — pattern not clear yet. Only 2 completed legs so far: departed +19 min. Not enough to call it.
The verdict above is that record speaking, so it reflects how AA4251 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 ORD and FSD published them.
Planning around AA4251? 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 — AA4251 Chicago to Sioux Falls on-time performance, measured from the ORD and FSD airport boards.
https://proflightsearch.com/flight/AA4251
.