AS4 SeattleSEA · 08:00 WashingtonDCA · 16:27
AS4 by Alaska Airlines flies from Seattle (SEA) to Washington (DCA) for the Fri, Sep 18 departure.
arrived at DCA · 45 min early
Where the minutes go
last 7 operations · gate push → arrivalThe bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.
The last 30 days
arrival outcome per operationmedian arrival −38 min · 0 cancelled · 8 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at SEA and DCA 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 Washington flights today
same route · Alaska AirlinesIf AS4 is cancelled, this is the other Alaska Airlines nonstop flight from Seattle to Washington 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 AS4 actually runs
Pro Flight Search has tracked every published board update for AS4 across the SEA and DCA boards: schedule changes, gate pushes and actual clocks. Usually lands ~37 min early. Based on 8 confirmed landings · 8/8 within 15 min of schedule.
The verdict above is that record speaking, so it reflects how AS4 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationAircraft
Recent tails: N559AS, N806AK, N577AS, N558AS.
Board clocks recorded as SEA and DCA published them.
Planning around AS4? 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 — AS4 Seattle to Washington on-time performance, measured from the SEA and DCA airport boards.
https://proflightsearch.com/flight/AS4
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