UA3903 Los AngelesLAX San FranciscoSFO · 11:06
UA3903 by United Airlines flies from Los Angeles (LAX) to San Francisco (SFO).
scheduled from LAX
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at LAX and SFO are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. These figures come from both airports' records 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 →
Tomorrow on this route
ForecastLos Angeles to San Francisco with United Airlines · Mon 2 Nov, local date
- Chance a departure is cancelled
- 0.2%1.3× usual
- Chance a departure leaves 60+ min late
- 10%0.7× usual
Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · About 11 departures a day on this route with this airline. · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.
When it flies
scheduled departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
Other Los Angeles to San Francisco flights today
same route · United AirlinesIf UA3903 is cancelled, these are the other United Airlines nonstop flights from Los Angeles to San Francisco on the same day, with scheduled departure times in LAX local time. Most flights that show a delay still operate. Rebooking usually helps only when that delay is very large. Every airline on this route →
How UA3903 actually runs
Pro Flight Search has tracked every published board update for UA3903 across the LAX and SFO boards: schedule changes, gate pushes and actual clocks. Early read: no clear pattern yet. Only 1 completed leg so far: landed +30 min. Not enough to call it.
The verdict above is that record speaking, so it reflects how UA3903 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationBoard clocks recorded as LAX and SFO published them.
Planning around UA3903? 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: UA3903 Los Angeles to San Francisco on-time performance, measured from the LAX and SFO airport boards.
https://proflightsearch.com/flight/UA3903
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