DL3821 DetroitDTW · 08:25 LouisvilleSDF · 09:54
DL3821 by Delta Air Lines flies from Detroit (DTW) to Louisville (SDF) for the Tue, Aug 18 departure.
arrived at SDF · 17 min early
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Early read, sample still buildingConditions at DTW and SDF 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 Detroit to Louisville flights today
same route · Delta Air LinesIf DL3821 is cancelled, these are the other Delta Air Lines nonstop flights from Detroit to Louisville on the same day, with scheduled departure times in DTW local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How DL3821 actually runs
Pro Flight Search has tracked every published board update for DL3821 across the DTW and SDF boards: schedule changes, gate pushes and actual clocks. Early read — pattern not clear yet. Only 1 completed leg so far: left a little late (~20 min) but landed about 17 min early. Not enough to call it.
The verdict above is that record speaking, so it reflects how DL3821 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationBoard clocks recorded as DTW and SDF published them.
Planning around DL3821? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — DL3821 Detroit to Louisville on-time performance, measured from the DTW and SDF airport boards.
https://proflightsearch.com/flight/DL3821
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