WN4021 SacramentoSMF · 07:25 Salt Lake CitySLC · 10:00
WN4021 by Southwest Airlines flies from Sacramento (SMF) to Salt Lake City (SLC).
scheduled from SMF
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 +10 min · 0 cancelled · 7 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at SMF and SLC 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 Sacramento to Salt Lake City flights today
same route · Southwest AirlinesIf WN4021 is cancelled, these are the other Southwest Airlines nonstop flights from Sacramento to Salt Lake City on the same day, with scheduled departure times in SMF local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How WN4021 actually runs
Pro Flight Search has tracked every published board update for WN4021 across the SMF and SLC boards: schedule changes, gate pushes and actual clocks. Usually lands ~15 min late. Based on 7 confirmed landings · 4/7 within 15 min of schedule.
The verdict above is that record speaking, so it reflects how WN4021 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: N429WN, N913WN, N242WN, N7879A.
Board clocks recorded as SMF and SLC published them.
Planning around WN4021? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — WN4021 Sacramento to Salt Lake City on-time performance, measured from the SMF and SLC airport boards.
https://proflightsearch.com/flight/WN4021
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