AS643 DenverDEN SeattleSEA
AS643 by Alaska Airlines flies from Denver (DEN) to Seattle (SEA).
estimated arrival at SEA · local time · ~2h 18m from now
position updated 4m ago · checking again in 90s
Live position · flown path, last 2h 51m
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at DEN 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.
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 Denver to Seattle flights today
same route · Alaska AirlinesIf AS643 is cancelled, these are the other Alaska Airlines nonstop flights from Denver to Seattle on the same day, with scheduled departure times in DEN local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How AS643 actually runs
Pro Flight Search has tracked every published board update for AS643 across the DEN and SEA boards: schedule changes, gate pushes and actual clocks. Combined risk score: 78.3/100. Based on airport operations, weather, and cached board history at DEN and SEA.
The verdict above is that record speaking, so it reflects how AS643 operates rather than what the timetable promises. Numbers refresh as new flights operate.
Planning around AS643? 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 — AS643 Denver to Seattle on-time performance, measured from the DEN and SEA airport boards.
https://proflightsearch.com/flight/AS643
.