WN3861 St LouisSTL · 06:30 ChicagoMDW · 07:35
WN3861 by Southwest Airlines flies from St Louis (STL) to Chicago (MDW) for the Wed, Sep 9 departure.
arrived at MDW · 8 min early
⚖ WN3861 typically leaves +13 and lands −4. The air wins minutes back.Where the minutes go
last 7 operations · gate push → arrivalThe bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.
The last 30 days
arrival outcome per operationmedian arrival −4 min · 0 cancelled · 12 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at STL and MDW 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 St Louis to Chicago flights today
same route · Southwest AirlinesIf WN3861 is cancelled, these are the other Southwest Airlines nonstop flights from St Louis to Chicago on the same day, with scheduled departure times in STL local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How WN3861 actually runs
Pro Flight Search has tracked every published board update for WN3861 across the STL and MDW boards: schedule changes, gate pushes and actual clocks. Usually lands on time. Based on 12 confirmed landings · 12/12 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 WN3861 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: N8648A, N7874B, N8898L, N936WN.
Board clocks recorded as STL and MDW published them.
Planning around WN3861? 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 — WN3861 St Louis to Chicago on-time performance, measured from the STL and MDW airport boards.
https://proflightsearch.com/flight/WN3861
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