WN4021 DenverDEN · 11:30 BirminghamBHM · 15:05
WN4021 by Southwest Airlines flies from Denver (DEN) to Birmingham (BHM).
scheduled from DEN
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at DEN and BHM 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 Denver to Birmingham flights today
same route · Southwest AirlinesIf WN4021 is cancelled, these are the other Southwest Airlines nonstop flights from Denver to Birmingham 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 WN4021 actually runs
Pro Flight Search has tracked every published board update for WN4021 across the DEN and BHM boards: schedule changes, gate pushes and actual clocks. Early read — pattern not clear yet. Only 2 completed legs so far: landed +11 min. Not enough to call it.
The verdict above is that record speaking, so it reflects how WN4021 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: N8771D, N927WN.
Board clocks recorded as DEN and BHM published them.
Planning around WN4021? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — WN4021 Denver to Birmingham on-time performance, measured from the DEN and BHM airport boards.
https://proflightsearch.com/flight/WN4021
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