UA1256 DenverDEN · 11:35 San JoseSJC · 13:18
UA1256 by United Airlines flies from Denver (DEN) to San Jose (SJC) for the Mon, Nov 9 departure.
departs DEN · on schedule
board checked 8m ago · checking again in 45s
⚖ UA1256 typically leaves −3 and lands −19. The air wins minutes back.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 −19 min · 0 cancelled · 9 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at DEN and SJC 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 at Denver
ForecastTue 10 Nov, local date
Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.
Tomorrow at San Jose
ForecastTue 10 Nov, local date
Forecast: GateWeather · incl. data from ECMWF (CC BY 4.0, modified) · 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 Denver to San Jose flights today
same route · United AirlinesIf UA1256 is cancelled, these are the other United Airlines nonstop flights from Denver to San Jose on the same day, with scheduled departure times in DEN 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 UA1256 actually runs
Pro Flight Search has tracked every published board update for UA1256 across the DEN and SJC boards: schedule changes, gate pushes and actual clocks. Usually lands ~15 min early. Based on 8 confirmed landings · 7/8 within 15 min of schedule. Pushes back late but makes up time in the air.
The verdict above is that record speaking, so it reflects how UA1256 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: N831UA, N447UA, N434UA, N474UA.
Board clocks recorded as DEN and SJC published them.
Planning around UA1256? 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: UA1256 Denver to San Jose on-time performance, measured from the DEN and SJC airport boards.
https://proflightsearch.com/flight/UA1256
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