UA5440 San FranciscoSFO · 13:40 Santa AnaSNA · 15:32
UA5440 by United Airlines flies from San Francisco (SFO) to Santa Ana (SNA) for the Wed, Sep 9 departure.
departs SFO · on schedule
board checked 13m ago · checking again in 45s
Where the minutes go
last 4 operations · gate push → arrivalThe bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at SFO and SNA 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 Santa Ana flights today
same route · United AirlinesIf UA5440 is cancelled, these are the other United Airlines nonstop flights from San Francisco to Santa Ana 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 UA5440 actually runs
Pro Flight Search has tracked every published board update for UA5440 across the SFO and SNA boards: schedule changes, gate pushes and actual clocks. Early read — pattern not clear yet. Only 3 completed legs so far: left right on schedule but landed about 26 min early. Not enough to call it.
The verdict above is that record speaking, so it reflects how UA5440 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: N131SY, N623UX.
Board clocks recorded as SFO and SNA published them.
Planning around UA5440? 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 — UA5440 San Francisco to Santa Ana on-time performance, measured from the SFO and SNA airport boards.
https://proflightsearch.com/flight/UA5440
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