WN3877 Salt Lake CitySLC · 16:30 DenverDEN · 18:00
WN3877 by Southwest Airlines flies from Salt Lake City (SLC) to Denver (DEN).
scheduled from SLC
Where the minutes go
last 6 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 +35 min · 0 cancelled · 6 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at SLC and DEN 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 Salt Lake City
ForecastSun 8 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 Denver
ForecastSun 8 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 Salt Lake City to Denver flights today
same route · Southwest AirlinesIf WN3877 is cancelled, these are the other Southwest Airlines nonstop flights from Salt Lake City to Denver on the same day, with scheduled departure times in SLC 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 WN3877 actually runs
Pro Flight Search has tracked every published board update for WN3877 across the SLC and DEN boards: schedule changes, gate pushes and actual clocks. Usually lands ~35 min late. Based on 6 confirmed landings · 1/6 within 15 min of schedule.
The verdict above is that record speaking, so it reflects how WN3877 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: N8823Q, N8826Q, N8946L, N8889Q.
Board clocks recorded as SLC and DEN published them.
Planning around WN3877? 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: WN3877 Salt Lake City to Denver on-time performance, measured from the SLC and DEN airport boards.
https://proflightsearch.com/flight/WN3877
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