DL4621 SeattleSEA Salt Lake CitySLC
DL4621 by Delta Air Lines flies from Seattle (SEA) to Salt Lake City (SLC).
scheduled from SEA
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at SEA and SLC 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 Seattle to Salt Lake City flights today
same route · Delta Air LinesIf DL4621 is cancelled, these are the other Delta Air Lines nonstop flights from Seattle to Salt Lake City on the same day, with scheduled departure times in SEA local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How DL4621 actually runs
Pro Flight Search has tracked every published board update for DL4621 across the SEA and SLC boards: schedule changes, gate pushes and actual clocks. Combined risk score: 33.0/100. Based on airport operations, weather, and cached board history at SEA and SLC.
The verdict above is that record speaking, so it reflects how DL4621 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 SEA and SLC published them.
Planning around DL4621? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — DL4621 Seattle to Salt Lake City on-time performance, measured from the SEA and SLC airport boards.
https://proflightsearch.com/flight/DL4621
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