UA4790 San FranciscoSFO · 12:50 SacramentoSMF · 13:52
UA4790 by United Airlines flies from San Francisco (SFO) to Sacramento (SMF) for the Tue, Aug 18 departure.
arrived at SMF · 101 min late
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 +25 min · 0 cancelled · 5 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at SFO 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 Francisco to Sacramento flights today
same route · United AirlinesIf UA4790 is cancelled, these are the other United Airlines nonstop flights from San Francisco to Sacramento on the same day, with scheduled departure times in SFO local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How UA4790 actually runs
Pro Flight Search has tracked every published board update for UA4790 across the SFO and SMF boards: schedule changes, gate pushes and actual clocks. Usually lands ~26 min late. Based on 4 confirmed landings · 1/4 within 15 min of schedule.
The verdict above is that record speaking, so it reflects how UA4790 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: N479CA, N923SW, N973SW.
Board clocks recorded as SFO and SMF published them.
Planning around UA4790? 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 — UA4790 San Francisco to Sacramento on-time performance, measured from the SFO and SMF airport boards.
https://proflightsearch.com/flight/UA4790
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