UA8139 DenverDEN San FranciscoSFO
UA8139 by United Airlines flies from Denver (DEN) to San Francisco (SFO).
scheduled from DEN
The route today
live boardsWeather lens
Weather-conditioned outlook for this flight right now
Measured, 90-day sampleDriven mainly by SFO (San Francisco), currently flying MVFR (marginal visual). 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 Denver to San Francisco flights today
same route · United AirlinesIf UA8139 is cancelled, these are the other United Airlines nonstop flights from Denver to San Francisco on the same day, with scheduled departure times in DEN local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How UA8139 actually runs
Pro Flight Search has tracked every published board update for UA8139 across the DEN and SFO boards: schedule changes, gate pushes and actual clocks. Combined risk score: 33.0/100. Based on airport operations, weather, and cached board history at DEN and SFO.
The verdict above is that record speaking, so it reflects how UA8139 operates rather than what the timetable promises. Numbers refresh as new flights operate.
Planning around UA8139? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — UA8139 Denver to San Francisco on-time performance, measured from the DEN and SFO airport boards.
https://proflightsearch.com/flight/UA8139
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