AS621 SeattleSEA · 11:32 San DiegoSAN · 14:42
AS621 by Alaska Airlines flies from Seattle (SEA) to San Diego (SAN) for the Thu, Sep 10 departure.
arrived at SAN · 11 min early
Where the minutes go
last 3 operations · gate push → arrivalThe bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at SEA and SAN 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 San Diego flights today
same route · Alaska AirlinesIf AS621 is cancelled, these are the other Alaska Airlines nonstop flights from Seattle to San Diego 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 AS621 actually runs
Pro Flight Search has tracked every published board update for AS621 across the SEA and SAN boards: schedule changes, gate pushes and actual clocks. Early read — pattern not clear yet. Only 3 completed legs so far: landed -27 min. Not enough to call it.
The verdict above is that record speaking, so it reflects how AS621 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 SAN published them.
Planning around AS621? 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 — AS621 Seattle to San Diego on-time performance, measured from the SEA and SAN airport boards.
https://proflightsearch.com/flight/AS621
.