WN3540 SeattleSEA San JoseSJC
WN3540 by Southwest Airlines flies from Seattle (SEA) to San Jose (SJC).
scheduled from SEA
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at SEA and SJC 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 Jose flights today
same route · Southwest AirlinesIf WN3540 is cancelled, these are the other Southwest Airlines nonstop flights from Seattle to San Jose 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 WN3540 actually runs
Pro Flight Search has tracked every published board update for WN3540 across the SEA and SJC 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 SJC.
The verdict above is that record speaking, so it reflects how WN3540 operates rather than what the timetable promises. Numbers refresh as new flights operate.
Planning around WN3540? 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 — WN3540 Seattle to San Jose on-time performance, measured from the SEA and SJC airport boards.
https://proflightsearch.com/flight/WN3540
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