AS421 SeattleSEA San José del CaboSJD
AS421 by Alaska Airlines flies from Seattle (SEA) to San José del Cabo (SJD).
scheduled from SEA
board checked 20m ago · checking again in 45s
The route today
live boardsTomorrow at Seattle
ForecastMon 9 Nov, local date
- 87% chance of rain
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 Seattle to San José del Cabo flights today
same route · Alaska AirlinesIf AS421 is cancelled, these are the other Alaska Airlines nonstop flights from Seattle to San José del Cabo on the same day, with scheduled departure times in SEA 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 AS421 actually runs
Pro Flight Search has tracked every published board update for AS421 across the SEA and SJD 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 SJD.
The verdict above is that record speaking, so it reflects how AS421 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 SJD published them.
Planning around AS421? 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: AS421 Seattle to San José del Cabo on-time performance, measured from the SEA and SJD airport boards.
https://proflightsearch.com/flight/AS421
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