AS521

SEA → SJC · Boeing 737-900 · Alaska Airlines

For travellers

Departure · Seattle (SEA)

Gate C11

Scheduled 16:32

Board status: On-Time

Airborne since 16:40 (ADS-B)

Board data from sea, updated 469 min ago; times local to each airport.

Flight

Status

Completed

Arrival confirmed via

ADS-B (callsign change)

Departure

Seattle Tacoma International Airport (SEA) — Seattle, United States

Scheduled departure

2026-10-02 23:32 UTC

Departed

2026-10-02 23:40 UTC

Arrival

Norman Y. Mineta San Jose International Airport (SJC) — San Jose, United States

Distance flown

1248 km

Straight-line distance

1122 km

Approach distance

79 km

Aircraft

Registration

N238AK

Type

Boeing 737-900

Seats

178 total (138 Economy, 24 Premium, 16 First)

CO2 (EMEP est., total)

30.9 t (292 kg/pax Business, 542 kg/pax First, 202 kg/pax Premium Economy, 180 kg/pax Economy)

Altitude & speed

Max altitude

35,000 ft

Max ground speed

471 kt

Tracked

1h 46m · 1,245 km

Altitude (ft, max 35,000)

Ground speed (kt, max 471)

Altitude (ft, max 35,000)

Ground speed (kt, max 471)

From the ADS-B positions we received; time since the first fix. A dashed stretch is a gap in reception, bridged by a straight line.

Route map

Airline

Alaska Airlines (ASA)

Latest flights

Departed	Flight	Route	Reg	Aircraft	Status	Distance
2026-10-02 23:40 UTC	ASA521	SEA → SJC Seattle → San Jose	N238AK	Boeing 737-900	Completed	1248 km
2026-10-01 23:37 UTC	ASA521	SEA → SJC Seattle → San Jose	N494AS	Boeing 737-900	Completed	1266 km
2026-09-30 23:45 UTC	ASA521	SEA → SJC Seattle → San Jose	N474AS	Boeing 737-900	Completed	1270 km
2026-09-29 23:44 UTC	ASA521	SEA → SJC Seattle → San Jose	N934AK	Boeing 737 MAX 9	Completed	1249 km

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