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Alaska Airlines, Inc.

Is AS521 delayed?

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

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Update time unavailable

Departure

Seattle

SEA

Scheduled

Sep 16

Arrival

San Jose

SJC

Scheduled

Sep 17

Times shown in airport local time

Flight details

Departure · UTC

Scheduled
Estimated
Not available
Actual
Not available

Arrival · UTC

Scheduled
Estimated
Not available
Actual
Not available
View this flight’s market

Market prices express trading expectations about a contract’s stated threshold. They do not confirm airline status. The linked market shows its terms and activity.

Recent arrivals

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

  • SEA → SJC

    18 min late

  • SEA → SJC

    20 min late

  • SEA → SJC

    7 min early

  • SEA → SJC

    15 min late

  • SEA → SJC

    3 min late
Flight history and details

Aug 17, 2026 — Sep 16, 2026

Observed arrivals
25
Arrivals over 15 minutes late
9
Observed cancellations
0
Observed occurrences
27

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 15, 2026ArrivedSeattleSan Jose
View this flight’s market
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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