WN3878 Salt Lake CitySLC · 18:20 DenverDEN · 19:45
WN3878 by Southwest Airlines flies from Salt Lake City (SLC) to Denver (DEN).
scheduled from SLC
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 SLC
ForecastThu 12 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
ForecastThu 12 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 WN3878 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 WN3878 actually runs
Pro Flight Search has tracked every published board update for WN3878 across the SLC and DEN boards: schedule changes, gate pushes and actual clocks. Early read: no clear pattern yet. Only 2 completed legs so far: landed +52 min. Not enough to call it.
The verdict above is that record speaking, so it reflects how WN3878 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: N9004H, N886GK.
Board clocks recorded as SLC and DEN published them.
Planning around WN3878? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search: WN3878 Salt Lake City to Denver on-time performance, measured from the SLC and DEN airport boards.
https://proflightsearch.com/flight/WN3878
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