UA1540 TucsonTUS · 05:15 DenverDEN · 08:12
UA1540 by United Airlines flies from Tucson (TUS) to Denver (DEN) for the Mon, Oct 19 departure.
arrived at DEN · 18 min early
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 · 8 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Early read, sample still buildingConditions at TUS 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. This route's tracked sample is still thin — treat these as an early read, not a precise forecast.
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 Tucson to Denver flights today
same route · United AirlinesIf UA1540 is cancelled, these are the other United Airlines nonstop flights from Tucson to Denver on the same day, with scheduled departure times in TUS local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How UA1540 actually runs
Pro Flight Search has tracked every published board update for UA1540 across the TUS and DEN boards: schedule changes, gate pushes and actual clocks. Usually lands ~18 min early. Based on 8 confirmed landings · 8/8 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 UA1540 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: N34282, N37473, N76529, N17315.
Board clocks recorded as TUS and DEN published them.
Planning around UA1540? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — UA1540 Tucson to Denver on-time performance, measured from the TUS and DEN airport boards.
https://proflightsearch.com/flight/UA1540
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