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Alaska Airlines, Inc.

Is AS521 delayed?

Service date: · Scheduled departure date (America/Los_Angeles)

Arrived

25 min early

Updated

Departure

Seattle

SEA

Actual

Scheduled 16:32

Aug 29

Arrival

San Jose

SJC

Actual

Scheduled 01:45

Aug 30

Times shown in airport local time

Flight details

Departure · UTC

Scheduled
Estimated
Actual

Arrival · UTC

Scheduled
Estimated
Actual

Recent arrivals

Dates below are arrival dates in the destination airport’s time zone. The detailed history uses service dates.

  • SEA → SJC

    16 min late

  • SEA → SJC

    18 min late

  • SEA → SJC

    20 min late

  • SEA → SJC

    7 min early

  • SEA → SJC

    15 min late
Flight history and details

Aug 18, 2026 — Sep 17, 2026

Observed arrivals
26
Arrivals over 15 minutes late
10
Observed cancellations
0
Observed occurrences
28

Results compare scheduled and actual arrival times. Cancelled or diverted flights are excluded. Some flights may be missing from the history.

How flight status works

AS521 Recent arrival history
Service dateDepartureArrivalActualArrival delay (minutes)
Sep 16, 2026ArrivedSeattleSan Jose
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16
Sep 15, 2026ArrivedSeattleSan Jose
18
Sep 14, 2026ArrivedSeattleSan Jose
20
Sep 13, 2026ArrivedSeattleSan Jose
-7
Sep 12, 2026ArrivedSeattleSan Jose
15
Sep 11, 2026ArrivedSeattleSan Jose
3
Sep 10, 2026ArrivedSeattleSan Jose
5
Sep 9, 2026ArrivedSeattleSan Jose
-3
Sep 8, 2026ArrivedSeattleSan Jose
21
Sep 7, 2026ArrivedSeattleSan Jose
43
Sep 6, 2026ArrivedSeattleSan Jose
11
Sep 4, 2026ArrivedSeattleSan Jose
8
Sep 3, 2026ArrivedSeattleSan Jose
-8
Sep 1, 2026ArrivedSeattleSan Jose
1
Aug 31, 2026ArrivedSeattleSan Jose
9
Aug 30, 2026ArrivedSeattleSan Jose
-1
Aug 29, 2026ArrivedSeattleSan Jose
-25
Aug 28, 2026ArrivedSeattleSan Jose
24
Aug 27, 2026ArrivedSeattleSan Jose
-11
Aug 26, 2026ArrivedSeattleSan Jose
1
Aug 25, 2026ArrivedSeattleSan Jose
3
Aug 24, 2026ArrivedSeattleSan Jose
3
Aug 23, 2026ArrivedSeattleSan Jose
46
Aug 22, 2026ArrivedSeattleSan Jose
-8
Aug 21, 2026ArrivedSeattleSan Jose
20
Aug 19, 2026ArrivedSeattleSan Jose
51

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