WN4539 San DiegoSAN · 10:00 SacramentoSMF · 11:40
WN4539 by Southwest Airlines flies from San Diego (SAN) to Sacramento (SMF) for the Wed, Sep 9 departure.
departs SAN · on schedule
board checked 58m ago · checking again in 45s
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 −8 min · 0 cancelled · 5 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at SAN and SMF 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 San Diego to Sacramento flights today
same route · Southwest AirlinesIf WN4539 is cancelled, these are the other Southwest Airlines nonstop flights from San Diego to Sacramento on the same day, with scheduled departure times in SAN local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How WN4539 actually runs
Pro Flight Search has tracked every published board update for WN4539 across the SAN and SMF boards: schedule changes, gate pushes and actual clocks. Usually lands ~7 min early. Based on 5 confirmed landings · 5/5 within 15 min of schedule.
The verdict above is that record speaking, so it reflects how WN4539 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: N234WN, N299WN, N930WN, N7828A.
Board clocks recorded as SAN and SMF published them.
Planning around WN4539? 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 — WN4539 San Diego to Sacramento on-time performance, measured from the SAN and SMF airport boards.
https://proflightsearch.com/flight/WN4539
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