Alaska Airlines AS521 Flight Status
Based on Trip.com’s real-time data, the AS521 flight operated by Alaska Airlines on Sep 22, 2026 is scheduled to fly from Seattle (SEA) to San Jose (SJC). The flight is expected to depart at 16:32 and land at 18:45 .
Mon, Sep 21
Tue, Sep 22
Wed, Sep 23
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Scheduled
Your flight will depart on time.
2h 13m
Check-in Counter
ZONE 6,ZONE 7
Boarding Gate
C9
Arrival Gate
31
Baggage
B1
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Scheduled
Your flight will depart on time.
2h 13m
Check-in Counter
ZONE 6,ZONE 7
Boarding Gate
N8
Arrival Gate
UNPL
Baggage
B1
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Scheduled
Your flight will depart on time.
2h 13m
Check-in Counter
ZONE 6,ZONE 7
Boarding Gate
--
Arrival Gate
--
Baggage
--
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Information provided by VariFlight For the latest updates, please refer to airport announcements or consult your airline. You can also explore more flights from Seattle to San Jose or track other flights with our flight status tracker.
AS521 Aircraft Details
According to Trip.com real-time data, the AS521 flight flying from Seattle to San Jose on 9/22/2026 is operated by the aircraft model Boeing 737-900. This aircraft has been in service for 4y, 2m. The aircraft is equipped with 154 seats.
Boeing 737-900
Punctuality (Departure)
67%
Punctuality (Arrival)
93%
Early on average
3 minutes
Age
4y, 2m
Seats
154
Distance
--
Economy
First
Onboard Amenities
Snacks
Inflight entertainment is available
Wi-Fi (additional charge)
USB port and power outlet
Seating Plan
--
Legroom
43 cm
Seat width
100°
Reclining Angle
3-3
Seat layout example
Onboard Amenities
Snacks
Inflight entertainment is available
Wi-Fi (additional charge)
USB port and power outlet
Seating Plan
104 cm
More legroom than on 58% of flights
53 cm
Seat width better than on 19% of flights
120°
Reclining Angle
2-2
Seat layout example
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Flight History for AS521
Trip.com historical records show that the last AS521 flight departed on Mon, Sep 21 from SEA at approximately 16:32. This flight is expected to arrrive in SJC at 18:14.
| Date | Airport | Aircraft Type | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Departure | Arrival | |||||
| Thu, Sep 17 | Seattle (SEA) | San Jose (SJC) | B39M | 16:44 | 18:25 | Arrived |
| Fri, Sep 18 | Seattle (SEA) | San Jose (SJC) | 739 | 17:20 | 18:56 | Arrived |
| Sat, Sep 19 | Seattle (SEA) | San Jose (SJC) | 738 | 16:49 | 18:32 | Arrived |
| Sun, Sep 20 | Seattle (SEA) | San Jose (SJC) | 739 | 16:41 | 18:24 | Arrived |
| Mon, Sep 21 | Seattle (SEA) | San Jose (SJC) | B39M | 16:32 | 18:14 | Scheduled |
| Tue, Sep 22 | Seattle (SEA) | San Jose (SJC) | B39M | 16:32 | 18:45 | Scheduled |
| Wed, Sep 23 | Seattle (SEA) | San Jose (SJC) | 738 | 16:32 | 18:45 | Scheduled |
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AS521 On-Time Performance
Based on the average performance of this flight over the past 30 trips, the on-time departure rate of AS521 is 67% (Late on average 26 minutes), and the on-time arrival rate is 93% (Early on average 3 minutes).
On-Time Departures
Punctuality
67%
Late on average 26 minutes
Early
0%
On time
67%
30 mins late
27%
60 mins late
7%
90 mins late
0%
Cancelled
0%
On-Time Arrivals
Punctuality
93%
Early on average 3 minutes
Early
70%
On time
23%
30 mins late
7%
60 mins late
0%
90 mins late
0%
Cancelled
0%
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Frequently Asked Questions
What is the current status of flight as521?
Flight as521 has not departed yet and is currently on schedule. Scheduled departure 16:32, arrival 18:45 (updated Sep 22, 2026).Is flight as521 on time today?
Flight as521 has not departed yet and is currently on schedule. Scheduled departure is 16:32, with arrival at 18:45. Recheck gate and timing before you head to the airport.Has flight as521 departed yet? What is the departure time?
Flight as521 is scheduled to depart at 16:32. The latest actual or estimated departure time is 16:32, and the current status is Scheduled (updated Sep 22, 2026).When is flight as521 scheduled to arrive?
Flight as521 is scheduled to arrive at 18:45. The latest estimated or actual arrival time is 18:45. Status is Scheduled as of Sep 22, 2026.What is the baggage carousel number for flight as521?
After arrival, baggage for flight as521 is expected at carousel B1 in terminal B. Carousel numbers are assigned close to landing and may change—follow airport signs on arrival.What route does flight as521 fly?
Flight as521 is operated by Alaska Airlines from Seattle (SEA) to San Jose (SJC). Typical flight time is about 2 hours13 minutes; operating days may include Tuesday.How can I check real-time status for flight as521?
Track flight as521 on this Trip.com status page for live departure, arrival, gate and baggage updates. For push alerts on the go, open the same flight in the Trip.com App and turn on flight notifications.If flight as521 is delayed or canceled, what should I do?
If as521 is delayed or canceled, first confirm the latest status here (Scheduled, updated Sep 22, 2026). Contact Alaska Airlines or your booking channel for rebooking or refund options, and check Trip.com Manage Booking if you booked on Trip.com.Has flight as521 departed from Seattle?
Flight as521 has not departed from Seattle (SEA) yet and is currently on schedule for 16:32.What is the seat configuration for flight as521?
Flight as521 usually flies a Boeing 737-900 with seat layout 3-3. Layouts can differ by aircraft subtype and cabin product—confirm your seat map in Manage Booking after you purchase.
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Destination Info: San Jose Weather & Time
Intermittent clouds
|
14°C - 24°C
Expected weather conditions upon arrival
0 hour time difference
Time on arrival: Seattle 18:45| San Jose 18:45
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