UA3866 PortlandPDX DenverDEN
UA3866 by United Airlines flies from Portland (PDX) to Denver (DEN).
scheduled from PDX
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at PDX and DEN 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 Portland to Denver flights today
same route · United AirlinesIf UA3866 is cancelled, these are the other United Airlines nonstop flights from Portland to Denver on the same day, with scheduled departure times in PDX local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How UA3866 actually runs
Pro Flight Search has tracked every published board update for UA3866 across the PDX and DEN boards: schedule changes, gate pushes and actual clocks. Combined risk score: 50.0/100. Based on airport operations, weather, and cached board history at PDX and DEN.
The verdict above is that record speaking, so it reflects how UA3866 operates rather than what the timetable promises. Numbers refresh as new flights operate.
Planning around UA3866? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — UA3866 Portland to Denver on-time performance, measured from the PDX and DEN airport boards.
https://proflightsearch.com/flight/UA3866
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