Schedule: FAA flight plans.
ALASKA · FLIGHT AS 521
SCHEDULED
Today
AS 521 · SJC → SEA
departs 4:48 PM PT · arrives 6:55 PM PT
Forecast issued Sun 2:00 AM ET · 18h before departure
Odds over time
Arrive at SEA more than 15 minutes late?
26%
chance · ±1 pts
+3 pts · 24h
HOW SURE WE ARE
Good. The odds now lean mostly on firmed-up weather forecasts.
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How late will it get to SEA?
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On time or early
73%
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15–30 min late
13%
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30 min–1 hour late
6%
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1–2 hours late
5%
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Over 2 hours late
2%
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Cancelled
<1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.