AS521 · ASA521

ASA521 over the last 30 days

As of 2026-10-28

ASA521 is operated by Alaska Airlines on the route Seattle–Tacoma International Airport (SEA/KSEA) → Mineta San Jose International Airport (SJC/KSJC). It usually takes off around 21:00 UTC (14:00 local time, SEA). It usually lands around 22:46 UTC (15:46 local time, SJC). Most frequent aircraft type: BOEING 737 MAX 9 (B39M).

Days with an observed flight (last 30 days)

28/30

Days of the week with an observed flight

Mon, Tue, Wed, Thu, Fri, Sat, Sun

Typical take-off

21:00 UTC · 14:00 local time (SEA)

Typical landing

22:46 UTC · 15:46 local time (SJC)

Typical time airborne

101 min

Median departure deviation from the usual time on this route

+3 min

Departures within 15 minutes of the usual time

77 %

Departures measured

130

Our measurement against the usual departure time of the route, from our own observations over the last 28 days; the figures cover all flights of this airline on the route.

Aircraft types on this flight (last 30 days)

• BOEING 737 MAX 9 (B39M) — Number of flights: 34
• BOEING 737-900 (B739) — Number of flights: 18
• BOEING 737-800 (B738) — Number of flights: 11

Aircraft in the last 7 days

• N729AL · BOEING 737 MAX 9 2026-10-28
• N552AS · BOEING 737-800 2026-10-27
• N815AK · BOEING 737 MAX 8 2026-10-27
• N518AS · BOEING 737-800 2026-10-25
• N942AK · BOEING 737 MAX 9 2026-10-25
• N559AS · BOEING 737-800 2026-10-24

Related flights on this route

• All flights KSEA – KSJC