UA645 DenverDEN · 17:30 Sioux FallsFSD · 20:07
UA645 by United Airlines flies from Denver (DEN) to Sioux Falls (FSD) for the Wed, Sep 16 departure.
arrived at FSD · 18 min early
⚖ UA645 typically leaves −3 and lands −18. 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 −18 min · 0 cancelled · 9 operations tracked
The route today
live boardsWeather lens
Weather-conditioned outlook for this flight right now
Measured, 90-day sampleDriven mainly by FSD (Sioux Falls), currently flying IFR (instrument). 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 Sioux Falls flights today
same route · United AirlinesIf UA645 is cancelled, these are the other United Airlines nonstop flights from Denver to Sioux Falls 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 UA645 actually runs
Pro Flight Search has tracked every published board update for UA645 across the DEN and FSD boards: schedule changes, gate pushes and actual clocks. Usually lands ~16 min early. Based on 9 confirmed landings · 8/9 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 UA645 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: N484UA, N464UA, N495UA, N496UA.
Board clocks recorded as DEN and FSD published them.
Planning around UA645? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — UA645 Denver to Sioux Falls on-time performance, measured from the DEN and FSD airport boards.
https://proflightsearch.com/flight/UA645
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