WN4157 St LouisSTL · 08:25 San FranciscoSFO · 10:35
WN4157 by Southwest Airlines flies from St Louis (STL) to San Francisco (SFO).
scheduled from STL
Where the minutes go
last 5 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 +17 min · 0 cancelled · 5 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at STL and SFO 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 San Francisco flights today
same route · Southwest AirlinesIf WN4157 is cancelled, this is the other Southwest Airlines nonstop flight from St Louis to San Francisco 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 WN4157 actually runs
Pro Flight Search has tracked every published board update for WN4157 across the STL and SFO boards: schedule changes, gate pushes and actual clocks. Usually lands ~17 min late. Based on 5 confirmed landings · 2/5 within 15 min of schedule.
The verdict above is that record speaking, so it reflects how WN4157 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: N8576Z, N8727M, N8682B.
Board clocks recorded as STL and SFO published them.
Planning around WN4157? 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 — WN4157 St Louis to San Francisco on-time performance, measured from the STL and SFO airport boards.
https://proflightsearch.com/flight/WN4157
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