AS1340 San FranciscoSFO · 16:51 SeattleSEA · 19:07
AS1340 by Alaska Airlines flies from San Francisco (SFO) to Seattle (SEA) for the Tue, Sep 8 departure.
departs SFO · on schedule
board checked 9m ago · checking again in 45s
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Early read, sample still buildingConditions at SFO and SEA 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 San Francisco to Seattle flights today
same route · Alaska AirlinesIf AS1340 is cancelled, these are the other Alaska Airlines nonstop flights from San Francisco to Seattle on the same day, with scheduled departure times in SFO local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How AS1340 actually runs
Pro Flight Search has tracked every published board update for AS1340 across the SFO and SEA boards: schedule changes, gate pushes and actual clocks. Early read — pattern not clear yet. Only 1 completed leg so far: departed +7 min. Not enough to call it.
The verdict above is that record speaking, so it reflects how AS1340 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 SFO and SEA published them.
Planning around AS1340? 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 — AS1340 San Francisco to Seattle on-time performance, measured from the SFO and SEA airport boards.
https://proflightsearch.com/flight/AS1340
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