UA3809 San FranciscoSFO · 22:30 San JoseSJC · 04:15
UA3809 by United Airlines flies from San Francisco (SFO) to San Jose (SJC).
Same number through SFO → BNA → SJC
scheduled from SFO
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at SFO and SJC 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 San Jose flights today
same route · United AirlinesIf UA3809 is cancelled, these are the other United Airlines nonstop flights from San Francisco to San Jose 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 UA3809 actually runs
Pro Flight Search has tracked every published board update for UA3809 across the SFO and SJC boards: schedule changes, gate pushes and actual clocks. Early read — pattern not clear yet. Only 2 completed legs so far: landed +94 min. Not enough to call it.
The verdict above is that record speaking, so it reflects how UA3809 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: N209UA.
Board clocks recorded as SFO and SJC published them.
Planning around UA3809? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — UA3809 San Francisco to San Jose on-time performance, measured from the SFO and SJC airport boards.
https://proflightsearch.com/flight/UA3809
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