Flight Status & Tracker

ASA521

ALASKA AIRLINES INC · SJC → SEA · Last tracked Sep 29, 2026

ASA521 is a flight number operated by ALASKA AIRLINES INC between Norman Y. Mineta San Jose International Airport (KSJC) and Seattle Tacoma International Airport (KSEA). SkyMeter last tracked ASA521 on September 28, 2026. The flight is most often flown by a BOEING Boeing 737-900. Typical block time is 1h 45m. SkyMeter has observed 87 legs of this flight number via ADS-B.

SkyMeter tracks historical flight activity from ADS-B data — this is not a live gate-to-gate status feed.

✈
FLIGHTS
87
last 90 days
⏱
AVG DURATION
1h 45m
tracked time
📅
SERVICE PERIOD
5/27/2025 → 9/29/2026
first → last seen
🗺
ROUTES / TYPES
8 / 5
city pairs · airframes
⚠
INCIDENT RATE
0.0%
0 flagged

Routes flown

By count · last 90 days

5
KSJC → KSEA
38
avg 1h 55m · Norman Y. Mineta San Jose → Seattle Tacoma
KSEA → KSJC
26
avg 1h 57m · Seattle Tacoma → Norman Y. Mineta San Jose
US-2788 → KSEA
1
avg 1h 30m · Santa Clara Valley → Seattle Tacoma
WA11 → KSJC
1
avg 1h 55m · Boeing Military Airplanes Heliport → Norman Y. Mineta San Jose
WN93 → KSEA
1
avg 11m · Park 90 Heliport → Seattle Tacoma

Aircraft types

Equipment used on this number

5
B739 BOEING Boeing 737-900
56
B39M BOEING Boeing 737 MAX 9
47
B738 BOEING Boeing 737-800
15
B38M BOEING Boeing 737 MAX 8
4
B737 BOEING Boeing 737-700
1

Safety profile

Flagged flights · last 90 days

Go-arounds
0
Unstable approach
0
Rejected TO
0
Stall warnings
0
Overspeeds
0
Runway excursion
0
Counts represent flights with at least one occurrence of each flag, not the total event count. See /incidents for individual events.

Recent flights

Newest 30 operations of ASA521

30
N442ASBOEING Boeing 737-900
→
9/29/2026
33m
No alerts
Replay Analysis
N968AKBOEING Boeing 737 MAX 9
→
9/28/2026
1h 28m
No alerts
Replay Analysis
N958AKBOEING Boeing 737 MAX 9
→
9/26/2026
1h 42m
No alerts
Replay Analysis
N457ASBOEING Boeing 737-900
→
9/25/2026
26m
No alerts
Replay Analysis
N585ASBOEING Boeing 737-800
→
9/24/2026
1h 34m
No alerts
Replay Analysis
N585ASBOEING Boeing 737-800
→
9/24/2026
28m
No alerts
Replay Analysis
N585ASBOEING Boeing 737-800
→
9/24/2026
2h 3m
No alerts
Replay Analysis
N972AKBOEING Boeing 737 MAX 9
→
9/23/2026
1h 27m
No alerts
Replay Analysis
N972AKBOEING Boeing 737 MAX 9
→
9/23/2026
22m
No alerts
Replay Analysis
N972AKBOEING Boeing 737 MAX 9
→
9/23/2026
1h 49m
No alerts
Replay Analysis
N921AKBOEING Boeing 737 MAX 9
→
9/22/2026
1h 30m
No alerts
Replay Analysis
N921AKBOEING Boeing 737 MAX 9
→
9/22/2026
19m
No alerts
Replay Analysis
N921AKBOEING Boeing 737 MAX 9
→
9/22/2026
1h 49m
No alerts
Replay Analysis
N236AKBOEING Boeing 737-900
→
9/21/2026
1h 31m
No alerts
Replay Analysis
N236AKBOEING Boeing 737-900
→
9/21/2026
18m
No alerts
Replay Analysis
N236AKBOEING Boeing 737-900
→
9/21/2026
1h 49m
No alerts
Replay Analysis
N527ASBOEING Boeing 737-800
→
9/20/2026
1h 35m
No alerts
Replay Analysis
N527ASBOEING Boeing 737-800
→
9/20/2026
34m
No alerts
Replay Analysis
N527ASBOEING Boeing 737-800
→
9/20/2026
2h 10m
No alerts
Replay Analysis
N298AKBOEING Boeing 737-900
→
9/19/2026
1h 50m
No alerts
Replay Analysis
N712ALBOEING Boeing 737 MAX 9
→
9/18/2026
1h 29m
No alerts
Replay Analysis
N712ALBOEING Boeing 737 MAX 9
→
9/18/2026
33m
No alerts
Replay Analysis
N712ALBOEING Boeing 737 MAX 9
→
9/18/2026
2h 3m
No alerts
Replay Analysis
N734ALBOEING Boeing 737 MAX 9
→
9/17/2026
1h 46m
No alerts
Replay Analysis
N723ALBOEING Boeing 737 MAX 9
→
9/16/2026
1h 43m
No alerts
Replay Analysis
N723ALBOEING Boeing 737 MAX 9
→
9/16/2026
21m
No alerts
Replay Analysis
N723ALBOEING Boeing 737 MAX 9
→
9/16/2026
2h 5m
No alerts
Replay Analysis
N938AKBOEING Boeing 737 MAX 9
→
9/15/2026
1h 42m
No alerts
Replay Analysis
N491ASBOEING Boeing 737-900
→
9/14/2026
1h 30m
No alerts
Replay Analysis
N977AKBOEING Boeing 737 MAX 9
→
9/13/2026
24m
No alerts
Replay Analysis
© SkyMeter · All flight data subject to ODbL attribution · Tracked: 90-day window