AS521: Alaska flight 521
Seattle (SEA) → San Jose (SJC) · departs 1:40p, lands 3:52p local · Mon, Tue, Thu, Fri, Sat, Sun
The timetable below has every scheduled departure; for today's flight, check Alaska.
An estimate from the published timetable, not live tracking: it cannot know about delays, diversions or cancellations.
Live status at Alaska →The route
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AS521 timetable
Published departure and arrival times, each in its airport's local time, from the flights we sampled.
| Route | Departs | Arrives | Scheduled | Days |
|---|---|---|---|---|
| SEA → SJCSeattle to San Jose | 11:50a | 2:02p | 2h12m | Wed |
| SEA → SJCSeattle to San Jose | 1:40p | 3:52p | 2h12m | Mon, Tue, Thu, Fri, Sat, Sun |
| SJC → SEASan Jose to Seattle | 4:48p | 7:01p | 2h13m | Daily |
Other nonstops from Seattle to San Jose
The departures either side of AS521. Times are Seattle time.
| Flight | Departs | Days |
|---|---|---|
| Alaska AS658 | 10:58a | Mon, Tue, Thu, Fri, Sat, Sun |
| Delta | 11:30a | Daily |
| Southwest | 12:25p | Mon, Thu, Fri, Sat |
| This flight AS521 | 1:40p | Mon, Tue, Thu, Fri, Sat, Sun |
| Delta | 2:45p | Daily |
| Alaska AS657 | 3:48p | Mon, Tue, Wed, Thu, Fri, Sun |
| Delta | 4:30p | Daily |
All 19 flights from SEA to SJC, by time →
How AS521 ran in our sample
SEA → SJC
6 of 7 departures left within 15 minutes of schedule (Oct 14–20). Only flights that departed are counted: cancellations are not in our data.
Aircraft: Boeing 737 MAX 9 on 2 of 7; also Boeing 737-800 (2), Boeing 737-900 (2), Boeing 737 MAX 8 (1).
SJC → SEA
6 of 7 departures left within 15 minutes of schedule (Oct 4–10). Only flights that departed are counted: cancellations are not in our data.
Other flights on this route: AS1304 · AS1311 · AS659 · AS745 · all of them →
What time does AS521 leave Seattle?
AS521 is scheduled to depart Seattle (SEA) at 11:50a (Wed), 1:40p (Mon, Tue, Thu, Fri, Sat, Sun), Seattle time, and to land in San Jose (SJC) at about 2:02p local time, a scheduled 2h12m. Times are the published ones from the flights we sampled Oct 14–20; check Alaska for today's.
What time does AS521 leave San Jose?
AS521 is scheduled to depart San Jose (SJC) at 4:48p (daily), San Jose time, and to land in Seattle (SEA) at about 7:01p local time, a scheduled 2h13m. Times are the published ones from the flights we sampled Oct 4–10; check Alaska for today's.
What plane is AS521?
Boeing 737 MAX 9 on 2 of the 7 AS521 flights from SEA we sampled Oct 14–20; the rest were a Boeing 737-800 or Boeing 737-900 or Boeing 737 MAX 8. Airlines swap aircraft, so the plane on a given day can differ.
Does AS521 fly every day?
Yes — AS521 flew Seattle to San Jose every day of the week we sampled (Oct 14–20).
Is AS521 usually on time?
Of 7 AS521 departures from SEA we sampled Oct 14–20, 6 left within 15 minutes of the scheduled time. That counts only flights that departed — cancellations are not in our data — and one week is a small sample, so treat it as a hint, not a rating.
More Alaska flights from Seattle
Timetable from Alaska departures we observed; AS521 is a Alaska Airlines flight number, and Hop Nonstop is not affiliated with Alaska. Schedules change — confirm with the airline before you travel.